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General Contact Lens Care and Questions A discussion of the general questions related to contact lens care and application


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  #101  
Old 10-05-2010, 10:48 AM
Knotlob Knotlob is offline
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Quote:
Originally Posted by lurker2010 View Post
If it was safe and legal to dispense contact lenses by just converting a spectacle RX to a contact lens RX people wouldn't have to post their RX on the web for help. The internet vendors would be doing the conversion for you.
There is nothing as far as I know illegal about DIY conversions from Spectacle to Contact prescriptions. There are several tools on the internet which claim to be able to help you do this.

But, they will probably only give you an approximate conversion and if provided by a specific lens manufacturer will often give results approximated to fit the lenses they sell.

In addition, the results by any method should be viewed as a starting point, from which, the optician can fine tune the lens prescription, especially for astigmatism.

It goes without saying that for contact lenses, the contacts should be checked for fit and the general eye health assessed by a competent Eye Care Professional, to ensure they are compatible with contact lenses.

knotlob
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  #102  
Old 10-05-2010, 01:36 PM
lurker2010 lurker2010 is offline
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Sometimes I don't express myself clearly. Some posters are from other countries. English may not be their main language. I may be talking in "shorthand". We agree 100% of the time.

My point is if it was as simple as putting a spectacle RX into a computer (or into a spreadsheet) and getting a Contact Lens RX then it would be legal and OK for lens.com (or any other vendor) to ask for your spectacle RX. They could put your spectacle RX into their computer and sell you whatever brand of contacts you wish to purchase. The fact that lens.com isn't allowed to dispense contacts based on a spectacle RX tells us patients shouldn't be self prescribing contacts based on a spectacle RX.

There are different base curves. Different lens diameters. Different materials. Different lens thicknesses. Different wear schedules. The doctor uses a (slit?) to see how the lens looks in your eye. A good doctor might have you try many different trial lenses. A good doctor will have you return and make sure the contacts are OK. US doctors generally charge more for exams in which they prescribe toric or bifocal lenses. Harder to fit. More trial lenses. More visits.

Some posters ask for conversion help so they can see what lenses might be available in their RX. Makes some sense. Why waste time if your RX is so high contacts aren't available. Sounds reasonable except most people can be fitted for contacts. A few companies have extended range lenses available. Some vial lenses are "made to order". RGP can correct a large range of issues. Posters who get their RX converted and then check lens.com may be missing products.

I'm afraid some posters want to purchase contacts without a current contact lens exam.

It's certainly legal to post a formula or converter tool to go from a spectacle RX to contact RX. It's not legal (most places) to purchase contacts based on such a calculation. A contact lens RX is generally required.

I can sort of understand,(but I think it's wrong, a patient who wants to skip a contact lens exam for plano lenses (novelty). I can sort of understand , but I think it's a mistake) for a patient to fudge his RX data so he can order replacement lenses even though his RX has expired.

I think its crazy for a patient to convert a spectacle RX to toric contacts. Only a crazy (or ignorant) person thinks the doctor is charging a $100 for the 10 seconds it takes to do the mathematical conversion. I'm not going to take the time and search. I remember several posters thinking their doctor has a lot of nerve charging so much for just a quick calculation. It's possible some posters have horrible doctors.

We both agree on the importance of a contact lens eye exam. I think a number of posters plan on using the results of the conversion to order lenses without such an exam. We'll never know if I'm too cynical or if you're too trusting.





Quote:
Originally Posted by Knotlob View Post
There is nothing as far as I know illegal about DIY conversions from Spectacle to Contact prescriptions. There are several tools on the internet which claim to be able to help you do this.

But, they will probably only give you an approximate conversion and if provided by a specific lens manufacturer will often give results approximated to fit the lenses they sell.

In addition, the results by any method should be viewed as a starting point, from which, the optician can fine tune the lens prescription, especially for astigmatism.

It goes without saying that for contact lenses, the contacts should be checked for fit and the general eye health assessed by a competent Eye Care Professional, to ensure they are compatible with contact lenses.

knotlob
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  #103  
Old 10-05-2010, 02:11 PM
Knotlob Knotlob is offline
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Quote:
Originally Posted by lurker2010 View Post
Sometimes I don't express myself clearly. Some posters are from other countries. English may not be their main language. I may be talking in "shorthand". We agree 100% of the time.

My point is if it was as simple as putting a spectacle RX into a computer (or into a spreadsheet) and getting a Contact Lens RX then it would be legal and OK for lens.com (or any other vendor) to ask for your spectacle RX. They could put your spectacle RX into their computer and sell you whatever brand of contacts you wish to purchase. The fact that lens.com isn't allowed to dispense contacts based on a spectacle RX tells us patients shouldn't be self prescribing contacts based on a spectacle RX.

There are different base curves. Different lens diameters. Different materials. Different lens thicknesses. Different wear schedules. The doctor uses a (slit?) to see how the lens looks in your eye. A good doctor might have you try many different trial lenses. A good doctor will have you return and make sure the contacts are OK. US doctors generally charge more for exams in which they prescribe toric or bifocal lenses. Harder to fit. More trial lenses. More visits.

Some posters ask for conversion help so they can see what lenses might be available in their RX. Makes some sense. Why waste time if your RX is so high contacts aren't available. Sounds reasonable except most people can be fitted for contacts. A few companies have extended range lenses available. Some vial lenses are "made to order". RGP can correct a large range of issues. Posters who get their RX converted and then check lens.com may be missing products.

I'm afraid some posters want to purchase contacts without a current contact lens exam.

It's certainly legal to post a formula or converter tool to go from a spectacle RX to contact RX. It's not legal (most places) to purchase contacts based on such a calculation. A contact lens RX is generally required.

I can sort of understand,(but I think it's wrong, a patient who wants to skip a contact lens exam for plano lenses (novelty). I can sort of understand , but I think it's a mistake) for a patient to fudge his RX data so he can order replacement lenses even though his RX has expired.

I think its crazy for a patient to convert a spectacle RX to toric contacts. Only a crazy (or ignorant) person thinks the doctor is charging a $100 for the 10 seconds it takes to do the mathematical conversion. I'm not going to take the time and search. I remember several posters thinking their doctor has a lot of nerve charging so much for just a quick calculation. It's possible some posters have horrible doctors.

We both agree on the importance of a contact lens eye exam. I think a number of posters plan on using the results of the conversion to order lenses without such an exam. We'll never know if I'm too cynical or if you're too trusting.
Well the problem as always on a public forum is that we don't know the person asking the question personally, nor indeed who else may be reading such posts (guests or members). Therefore, the exact motivation is unclear as to the reason for their request. Some may just want to do their homework first, others, as you say, certainly hope to avoid the $120 fee for the contact lens exam.

In the US and some other places, a prescription is going to be necessary to order the lenses. In Germany, an official prescription is probably NOT required.

We both agree that the eye exam is extremely important. Some people who are regular/experienced/knowledgeable contact lens users will know a lot about the lenses and their care. They may want to update a spectacle prescription to a contact lens prescription to see if it has changed much compared to their previous contacts. Personally, I like to do a reality check to see that, what the optician specifies for my eyes, is sensible and if not, get an explanation why not, just to put my mind at ease . I have had an optician incorrectly specify the prescription for a scuba dive mask, but as I knew all about dioptres and things like that from school, I spotted their error immediately.

As regards RGP lenses, the Base Curve fitting is very intolerant and must be measured with precision and then the optician/lens fitter must, using their skill and experience/manufacturer guidance, specify a precise Base Curve and order the lenses to that specification. DIY prescriptions will just not work. Soft lenses are much more tolerant of base curve and probably fit 60-70% of wearers first fitting. There isn't usually much choice in base curve from stock, run of the mill soft contacts anyway. But the contact lens eye exam is still required to check eye health and lens fit.

But again, these formulae provide, at best, a starting point from which, to fine tune the actual prescription. Even if the optician does the eye check from scratch and fits the lens, in Europe at least, it is normal to go back in a week or two for a check on vision, lens fit and to clear up any problems or questions. These generally don't cost any extra, as they would be included in the overall price for the lenses, or at least the fitting charge.

The need for a professional eye check is just as great for plano novelty/coloured contacts as for regular prescription lenses, because of the eye health issues - no disagreement there.

As regards you being too cynical or me too trusting, I give the information with the normal 'Government Health Warning' - i.e. have a proper professional eye exam with the contacts. They are not my eyes, but I would not wish anyone to damage their eyes either. If I don't provide an answer, I don't think that will stop determined potential lens wearers guestimating the conversion or finding another calculation elsewhere, but without the 'Government Health Warnings' .

knotlob
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  #104  
Old 11-07-2010, 06:39 AM
adt1989 adt1989 is offline
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Default contact lense prescrition

hi guys i wondered if anyone would help me convert my glasses prescription with contact lenses?

i used to use -2.00 lenses on both eyes then switched back to glasses, but now thinking of going back to lenses, not much has changed in my glasses prescription but just wanted to check if my lenses prescription was right?

here is my glasses prescription as follows:

right sph: -1.00 cly -0.50 axix 25.0
left sph: -0.75 cly -0.50 axix 160.0
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  #105  
Old 11-07-2010, 10:34 PM
Contact Lens Fitter Contact Lens Fitter is offline
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Quote:
Originally Posted by adt1989 View Post
hi guys i wondered if anyone would help me convert my glasses prescription with contact lenses?

i used to use -2.00 lenses on both eyes then switched back to glasses, but now thinking of going back to lenses, not much has changed in my glasses prescription but just wanted to check if my lenses prescription was right?

here is my glasses prescription as follows:

right sph: -1.00 cly -0.50 axix 25.0
left sph: -0.75 cly -0.50 axix 160.0
You would need to know your corneal curvature and which lens you plan to order. Then you would have to see someone to check and make sure they're fitting right so you don't cause damage to your eyes.
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  #106  
Old 11-08-2010, 12:25 PM
mayibfrank mayibfrank is offline
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Quote:
Originally Posted by adt1989 View Post
hi guys i wondered if anyone would help me convert my glasses prescription with contact lenses?

i used to use -2.00 lenses on both eyes then switched back to glasses, but now thinking of going back to lenses, not much has changed in my glasses prescription but just wanted to check if my lenses prescription was right?

here is my glasses prescription as follows:

right sph: -1.00 cly -0.50 axix 25.0
left sph: -0.75 cly -0.50 axix 160.0
Did you read the two posts just above yours? The ones that say how there's more to changing from glasses to contact lenses to just converting the numbers in the prescription? Bottom line is if you wear glasses and would like to try contact lenses (again, in your case), it's best to be fitted professionally.
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  #107  
Old 11-23-2010, 12:39 AM
nansea nansea is offline
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Default helppppppppp...

i went to my eye doctor today.... and all he gave me was OD (cylinder)-2.25/-1.oo(sphere) OS (cylinder)-2.25/-.50(sphere)....
could ya HELP ME CONVERT my glasses to lenses... I am Nearsided... not much information...but please help... i don't really understand this whole converting thing... =(
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  #108  
Old 11-23-2010, 05:44 AM
Knotlob Knotlob is offline
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Quote:
Originally Posted by nansea View Post
i went to my eye doctor today.... and all he gave me was OD (cylinder)-2.25/-1.oo(sphere) OS (cylinder)-2.25/-.50(sphere)....
could ya HELP ME CONVERT my glasses to lenses... I am Nearsided... not much information...but please help... i don't really understand this whole converting thing... =(
Hello nansea

Welcome to the forum.

Your spherical correction is small, so the optician would not need to apply any vertex correction.

Your prescription is incomplete - there doesn't appear to be any axis data for your prescription so you will need to consult your eye care professional.

If you have read the posts here, you will know that fitting contact lenses is not as simple as just manipulating your spectacle prescription. The eye care professional must examine your eyes to see if they are healthy and suitable for contact lenses. They must also trial your eyes with contact lenses to determine the exact fit and to ensure that they float properly on your eye to prevent damage to your eye. They will explain which type of lens is best for you and how long to wear them, disinfect and care for them.

Once you have a correctly fitting, comfortable pair of lenses which give you good vision, then by all means buy a pair of these lenses from a Mail Order company of your choice if you wish to save money over the probable higher eye care practitioner's prices.

You should of course have a Contact Lens eye examination once/year to ensure that there are no problems developing. You won't necessarily feel these, but they can cause permanent damage to your eye sight if left uncorrected.

knotlob
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  #109  
Old 01-22-2011, 08:34 PM
palatink palatink is offline
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Hi, I have worn contacts on and off for years but now basically the costs of going back to the optician for another check is too much right now. I have just had a glasses eyesight check and been told that my prescription has changed to:

R: -2.25 (sph), -2.50 (cyl), 112.0 (axis)
L: -1.50 (sph), -3.50 (cyl), 47.0 (axis) 11.00 (BVD)

I know that I had astigmastism annd this makes it harder to formulate but basically I am looking for a guide as to what I can get away with to order as little as possible so I dont have to wear glasses in a wedding I am attending very soon. I will not be driving in contacts until I have some properly sorted from the opticians so it doesnt matter if a lil off as long as "it'll do"

Hope someone can help and ty in advance!
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  #110  
Old 01-23-2011, 04:25 AM
dith96 dith96 is offline
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now i have a bit different question, does anyone know how to convert the prescription from the contacts to eye glasses?

my contact prescriptions are:
Left: -4.00
Right: -4.50 / Cyl: -0.75 / Axis: 020

is anyone able to help me, how to convert this into eye glasses presription? thanks
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  #111  
Old 01-24-2011, 04:27 AM
tiffies09 tiffies09 is offline
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Default A Newbie Here and A Big Hello to Everyone Here

Oh my gosh HELP PLEASE I dont know if you guys can help me out or maybe refer me to a site that can but this is my question i have been wearing contact lenses for awhile now but i need to start wearing glasses now i have my up to date current RX for my contacts is there anyway or a formula to convert my contact lense rx into an eyeglass RX so i can get eyeglasses online i need a pair ASAP and i want to by pass going to the eye doctor for this. If anyone can please help me or advise me on what to do it would be greatly appreciated! Oh my contact lense rx is :
Left Eye is: BC 9.2 Pwr -4.50 CYL -1.00 DIA 14.5 and AXIS is 010
Right Eye is: BC 9.2 PWR -2.50 CYL -1.75 DIA 14.5 and AXIS is 160
These are Toric Visitint Monthly Lenses by Focus.

Oh P.S This is such a great site with all kinds of great information on it i wish i would have come across you guys earlier!:
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  #112  
Old 01-24-2011, 10:57 AM
ElaineKramer ElaineKramer is offline
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Default Need Glasses Now

Quote:
Originally Posted by tiffies09 View Post
Oh my gosh HELP PLEASE I dont know if you guys can help me out or maybe refer me to a site that can but this is my question i have been wearing contact lenses for awhile now but i need to start wearing glasses now i have my up to date current RX for my contacts is there anyway or a formula to convert my contact lense rx into an eyeglass RX so i can get eyeglasses online i need a pair ASAP and i want to by pass going to the eye doctor for this. If anyone can please help me or advise me on what to do it would be greatly appreciated! Oh my contact lense rx is :
Left Eye is: BC 9.2 Pwr -4.50 CYL -1.00 DIA 14.5 and AXIS is 010
Right Eye is: BC 9.2 PWR -2.50 CYL -1.75 DIA 14.5 and AXIS is 160
These are Toric Visitint Monthly Lenses by Focus.

Oh P.S This is such a great site with all kinds of great information on it i wish i would have come across you guys earlier!:
Hi tiffies09. Maybe when you get some new contact lenses you'll start to use some punctuation.

Anyway, if you've spent much time reading this site you will see that knotlob really knows a lot about contact lenses. I can't help but agree that if you want to switch from contacts to glasses, you really need to see a doctor. I'm sorry, but that's the only smart way to go.
Call up your local eye doctor and make an appointment to be fitted for glasses. You can tell them that you need to see the doctor right away, and they'll get you in as soon as possible.
You might even want to go to one of those one hour glasses places, but I'm not sure of the quality of their products. You'll have glasses on your face by the end of the day, but I can't guarantee you'll see well.

Good luck.
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  #113  
Old 01-25-2011, 03:45 PM
SummerBreeze3 SummerBreeze3 is offline
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Hi Knotlob, I was hoping to get your expert opinion on something:

I just went to the optometrist last week and after telling him I need to get more contacts, he gave me my prescription, which is:

OD -- sphere: -3.75, cylinder: -1.50, axis: 180
OS -- sphere: -4.75, cylinder: -1.75, axis: 180

I have astigmatism and normally uses Cooper Vision Vertex Torics, which I normally buy from a street store. This time, I thought I would try to take advantage of the prices through online stores.

The problem is, I can't input the cylinder OD -1.50 number into the systems online. The online stores says it's not available and that I have to get a contact lenses RX.

I don't think the receptionist at the optometrist office will be able to help, setting up a time to see the optometrist may be inconvenient and give them a reason to charge me a fee for nothing, and after doing that, my optometrist will probably say 'the optician will know what to do'. But I don't want to order from my regular optician this time as I want to save some money. I threw out the boxes for the old contacts so I have nothing to compare with.

So my I hoping you can recommend what the contact lens RX is most likely be based on my given prescription above. Thanks.
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  #114  
Old 01-25-2011, 04:15 PM
Walkthisway Walkthisway is offline
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Default A Suggestion

Quote:
Originally Posted by SummerBreeze3 View Post
Hi Knotlob, I was hoping to get your expert opinion on something:

I just went to the optometrist last week and after telling him I need to get more contacts, he gave me my prescription, which is:

OD -- sphere: -3.75, cylinder: -1.50, axis: 180
OS -- sphere: -4.75, cylinder: -1.75, axis: 180

I have astigmatism and normally uses Cooper Vision Vertex Torics, which I normally buy from a street store. This time, I thought I would try to take advantage of the prices through online stores.

The problem is, I can't input the cylinder OD -1.50 number into the systems online. The online stores says it's not available and that I have to get a contact lenses RX.

I don't think the receptionist at the optometrist office will be able to help, setting up a time to see the optometrist may be inconvenient and give them a reason to charge me a fee for nothing, and after doing that, my optometrist will probably say 'the optician will know what to do'. But I don't want to order from my regular optician this time as I want to save some money. I threw out the boxes for the old contacts so I have nothing to compare with.

So my I hoping you can recommend what the contact lens RX is most likely be based on my given prescription above. Thanks.
Hi SummerBreeze3. I'm not knotlob, but might I make a suggestion? Why not ask your doctor if you can use a -1.75 cylinder for both eyes?
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  #115  
Old 01-26-2011, 04:58 PM
SummerBreeze3 SummerBreeze3 is offline
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I guess I'll probably have to. Thanks Walkthisway.
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  #116  
Old 02-05-2011, 02:46 PM
mgash mgash is offline
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Default Contact lens conversion and multiple prescriptions

In March, 2009 an eye doctor gave me an Rx as follows for glasses:
OD -4.5 +1.5 145 and OS-4.0 add: 2.5 both eyes.

a year later I got fitted for contacts by a different doctor, who gave me a Rx for Oasys 8.5 14mm OD -3.25 and OS -3.75

This year I went to yet another doctor, who gave me the same Rx for my contacts, but also gave me an Rx for glasses as follows:
OD -3.00 -150 55 and OS -4.00 with an add of 2.5 both eyes.

How can I have 1.5 doper change on glasses prescriptions with no change on my contact prescription? Also both of my most recent prescriptions have a mid-point of 3.5, wouldn't this be the same prescription for both contacts and glasses?
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  #117  
Old 02-06-2011, 04:59 PM
Briah Briah is offline
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Default Help with Air Optix Rx

I`m hoping you guys can help me. Last year I was prescribed Air Optix for Astigmatism with values:

OD: Pwr -0.50 CYL -0.75 Axis 160 BC 8.7 Dia 14.5
OS: Pwr -0.50 CYL -1.75 Axis 020 BC 8.7 Dia 14.5

And I was really happy with them in the end (the optometrist had to tweak the prescription a few times). Long story short, I had a falling out with my optometrist and went somewhere else. The new guy said I`d been overcorrected and prescribed something weaker. Being pregnant at the time, I went with glasses - which I`m happy with.

Now, I`ve had my baby and have waited the appropriate amount of time for water retention to be a non-issue. I just had my eye exam yesterday to check my prescription as I`d like to get back into contacts. For some unknown reason, they don`t just give you a trial pair of contacts. You need to book a fitting etc. and they`re full until April (!!). I`m going overseas next week and in my opinion, have already been fitted within the last 12 months so its unnecessary. I want the same brand, just at a lower correction than before. I`m hoping you can take the astigmatism numbers from the contact prescription above and adjust the correction values with the numbers below. I`m hoping this will give an extremely accurate prescription since all other variables are accounted for (lens thickness etc)

The new Rx is:
OD: pl -1.50 x150
OS: -0.25 -2.25 x005

Thanks so much!

Last edited by Briah; 02-07-2011 at 01:21 PM..
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  #118  
Old 02-07-2011, 11:59 AM
Eagleye Eagleye is offline
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Default

Quote:
Originally Posted by mgash View Post
In March, 2009 an eye doctor gave me an Rx as follows for glasses:
OD -4.5 +1.5 145 and OS-4.0 add: 2.5 both eyes.

a year later I got fitted for contacts by a different doctor, who gave me a Rx for Oasys 8.5 14mm OD -3.25 and OS -3.75

This year I went to yet another doctor, who gave me the same Rx for my contacts, but also gave me an Rx for glasses as follows:
OD -3.00 -150 55 and OS -4.00 with an add of 2.5 both eyes.

How can I have 1.5 doper change on glasses prescriptions with no change on my contact prescription? Also both of my most recent prescriptions have a mid-point of 3.5, wouldn't this be the same prescription for both contacts and glasses?
Well mgash, to answer your question, sometimes our prescription might change over time, as you probably have noticed before in your own experience.

Also, measuring of a prescription is not an exact science. You can go to one doctor one day and get a glasses prescription of 1.5 and then see another doctor the next day and get a prescription of 2. I tend to think it's the nature of the exam. The eye doctor puts the lenses in front of your eyes and says "Which is better, one . . . or two?" I don't know about you, but sometimes I'm not sure. Was two better, or were they about the same? So that may explain why your prescriptions don't match. I don't know, that's just my guess.
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  #119  
Old 02-15-2011, 06:16 PM
smithmd15 smithmd15 is offline
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Red face Calculating glasses to contacts

How do you calculate a prescription for glasses to contacts? My prescription is right eye -4.50 cyl -100 axis 170 left eye -3.00 cyl -1.75 axis 180. Please help!
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  #120  
Old 02-15-2011, 08:24 PM
mgash mgash is offline
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Quote:
Originally Posted by smithmd15 View Post
How do you calculate a prescription for glasses to contacts? My prescription is right eye -4.50 cyl -100 axis 170 left eye -3.00 cyl -1.75 axis 180. Please help!
You go to an eye doctor, and get a contact fitting. If you haven't worn contacts before, you may not be a good candidate for them. You need a prescription to buy contacts, not just numbers.
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  #121  
Old 02-16-2011, 06:45 AM
smithmd15 smithmd15 is offline
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First of all I did go to a doctor where in the hell would I get the numbers from? Out of my rear end! I've read your posts which are similar to mine, so before you are a smarta** you need to read your own posts jerk!
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  #122  
Old 02-16-2011, 06:47 AM
smithmd15 smithmd15 is offline
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I went to 2 doctors for contacts. The axis is 10 for one doctor and 180 for the other how is this possible?
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  #123  
Old 02-16-2011, 09:57 AM
NYGiants NYGiants is offline
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Default Making the Switch

Quote:
Originally Posted by smithmd15 View Post
How do you calculate a prescription for glasses to contacts? My prescription is right eye -4.50 cyl -100 axis 170 left eye -3.00 cyl -1.75 axis 180. Please help!
So that prescription there is for your glasses, right? To convert from glasses to contact lenses is insanely complicated. I think I've seen the formula somewhere on this forum, but my head started to spin and I decided that if I ever wanted to convert a prescription from glasses to contact lenses I'd just let someone else do the math.
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  #124  
Old 02-17-2011, 03:10 PM
xoxo101 xoxo101 is offline
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Exclamation Please Help Me Convert

Can someone please tell me what my contact prescription should be if my eyeglass prescription is:

O.D (Right Eye) = -5.50 (Sphere)
O.S (Left Eye) = -4.75 (Sphere)

My doctor didn't indicate the cylinder number either.

Thanks!
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  #125  
Old 02-17-2011, 04:14 PM
Rosetyler Rosetyler is offline
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Quote:
Originally Posted by xoxo101 View Post
Can someone please tell me what my contact prescription should be if my eyeglass prescription is:

O.D (Right Eye) = -5.50 (Sphere)
O.S (Left Eye) = -4.75 (Sphere)

My doctor didn't indicate the cylinder number either.

Thanks!
Hello there xoxo101. I'm really terrible at math, so how about if I give you the formula provided by Sir Robin earlier in this 100+ post thread and you plug in the numbers?

Here goes:

There is a formula, it is normally only an issue if you have a prescription greater than =/-4.00
Fcl = Fsp * (1 - (d/Fsp)
Fcl = 1/contact lens power in diopters ie -6.00= -0.167
Fsp = 1/spectacle lens power in diopters ie -6.50= -0.154
d = distance from the eye to the spectacle lens in meters usually 12mm = 0.012

So an example would be . . .
A spherical eyeglass prescription of -6.50 so

Fcl = -0.154 * (1 - (0.012/-0.154))

-6.02 = -0.154 * 1.078
= -6.00
You round to the nearest 0.25 . . .
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  #126  
Old 02-22-2011, 04:23 AM
GeoffM GeoffM is offline
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Interesting stuff. However, I get different values from the two links provided earlier on in the thread, and the formula very early on. Here's my left eye (the right eye is virtually blind so no point in lenses for that):
Sph -1.50
Cyl -1.25
Axis 70

Using the formula I get -0.68 (let's say -0.75). The CIBAVision link gives the same output as input values (ie -1.5/-1.25/70). The ToriTrack gives -1.25/-1.00/70.

In addition, my vision is not out the centre of my eye (the pupil is displaced lower in the sphere due to coloboma and other conditions). I'm wondering whether toric lenses - which, as I understand are thicker at the base for weighting - would screw up the calculations. When I had an IOL for cataract removal the surgeon said the calculations were imperfect for my eye for that reason.

My optician (due to British NHS reasons beyond me, is a different person to the surgeon) was not overly keen on contacts and wanted me to try glasses first, otherwise I would have had a contact lens prescription from her. I'm just curious in the meantime and will get professional measurement and fitting soon.

Thanks.
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  #127  
Old 02-22-2011, 09:40 AM
Ragnarox Ragnarox is offline
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Quote:
Originally Posted by GeoffM View Post
Interesting stuff. However, I get different values from the two links provided earlier on in the thread, and the formula very early on. Here's my left eye (the right eye is virtually blind so no point in lenses for that):
Sph -1.50
Cyl -1.25
Axis 70

Using the formula I get -0.68 (let's say -0.75). The CIBAVision link gives the same output as input values (ie -1.5/-1.25/70). The ToriTrack gives -1.25/-1.00/70.

In addition, my vision is not out the centre of my eye (the pupil is displaced lower in the sphere due to coloboma and other conditions). I'm wondering whether toric lenses - which, as I understand are thicker at the base for weighting - would screw up the calculations. When I had an IOL for cataract removal the surgeon said the calculations were imperfect for my eye for that reason.

My optician (due to British NHS reasons beyond me, is a different person to the surgeon) was not overly keen on contacts and wanted me to try glasses first, otherwise I would have had a contact lens prescription from her. I'm just curious in the meantime and will get professional measurement and fitting soon.

Thanks.
Welcome to Lens 101, GeoffM. It sounds like you and your eyes have had quite a history together. Would you be willing to settle for wearing glasses, or do you really want to wear contact lenses?

Of course, the people at Lens.com really hope you want to wear contact lenses.
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  #128  
Old 02-22-2011, 10:32 AM
GeoffM GeoffM is offline
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Quote:
Originally Posted by Ragnarox View Post
Welcome to Lens 101, GeoffM. It sounds like you and your eyes have had quite a history together. Would you be willing to settle for wearing glasses, or do you really want to wear contact lenses?

Of course, the people at Lens.com really hope you want to wear contact lenses.
Yes, it's been quite a year after separate ops under general anaesthetic for each eye, then complications (cystoid macular edema), then super high pressure because of steroids treating the complication. Turns out my optician wanted to wait a little for my eye to settle down after the CME. So, yes contact lenses in the future but not just yet. I'm still on Acular and Timolol for the time being. My prescription is likely to change because of the above over the coming months but I need something to tide me over. At 20/US$30 for a new (single) lens, it's slightly cheaper than a new box of bog standard cheap contacts.

Ultimately I do want contact lenses (maybe just the left, possibly plano/cosmetic only for the right). I just dislike glasses, not so much the appearance, but cleaning them from fingerprints and rain.

I'm still interested in the variation of figures though.
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  #129  
Old 02-22-2011, 11:03 AM
ElaineKramer ElaineKramer is offline
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Default Input/Output Issues

Quote:
Originally Posted by GeoffM View Post
Yes, it's been quite a year after separate ops under general anaesthetic for each eye, then complications (cystoid macular edema), then super high pressure because of steroids treating the complication. Turns out my optician wanted to wait a little for my eye to settle down after the CME. So, yes contact lenses in the future but not just yet. I'm still on Acular and Timolol for the time being. My prescription is likely to change because of the above over the coming months but I need something to tide me over. At 20/US$30 for a new (single) lens, it's slightly cheaper than a new box of bog standard cheap contacts.

Ultimately I do want contact lenses (maybe just the left, possibly plano/cosmetic only for the right). I just dislike glasses, not so much the appearance, but cleaning them from fingerprints and rain.

I'm still interested in the variation of figures though.
I'm afraid I don't know very much about calculating contact lens prescriptions, but I didn't want to just leave you here with out any kind of reply at all. Best I can tell you is that we've got some people on this forum who are really good at this stuff, some of whom have already been heard from in this thread. Hopefully they can explain to you why you're getting different results from the calculations made. So you're putting the same exact numbers in, but different numbers are coming out, is that right?
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  #130  
Old 02-22-2011, 11:06 AM
GeoffM GeoffM is offline
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Quote:
Originally Posted by ElaineKramer View Post
So you're putting the same exact numbers in, but different numbers are coming out, is that right?
Correct - though the choice of product may alter the results as well.
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  #131  
Old 02-22-2011, 11:23 AM
ElaineKramer ElaineKramer is offline
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Quote:
Originally Posted by GeoffM View Post
Correct - though the choice of product may alter the results as well.
I see. (Sorry, no pun intended.) Well, as I said, I hope someone smarter than I am comes along and can give you the information you need.
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  #132  
Old 02-25-2011, 09:56 AM
Shade Maiden Shade Maiden is offline
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This has got to be one of the longest threads on Lens 101, if not the longest.
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  #133  
Old 02-26-2011, 04:23 PM
beckeahnna beckeahnna is offline
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Question Help with Conversion

My contact perscription reads D -1.75 (I know both of my eyes have the same perscription) with a BC of 8.5 and a DIA of 14.2. Is this enough info to change into a glasses perscription? I have a standard axis of 12mm approx. Please let me know as soon as possible - I have a lead of some inexpensive glasses if I can get this calculated in time! Thank you!!!
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  #134  
Old 02-27-2011, 09:31 PM
kake kake is offline
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Default I register just to tell you guys

I found an online converter. It is accurate.

numericalexample.com/content/view/32/33

I did the formula on this page and got -8.241758244 on 12 mm glasses from a -7.5 contact prescription. The online converter showed the same answer of -8.24.
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  #135  
Old 02-28-2011, 09:57 AM
UNIT UNIT is offline
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Default Online Converter

Quote:
Originally Posted by kake View Post
I found an online converter. It is accurate.

numericalexample.com/content/view/32/33

I did the formula on this page and got -8.241758244 on 12 mm glasses from a -7.5 contact prescription. The online converter showed the same answer of -8.24.
Thanks for the information, kake. (Now I'm hearing that "Short Skirt, Long Jacket" song in my head.)

I went to that site and I plugged my glasses prescription in. It's -1.75 and the answer came back -1.75 in contact lenses too. How can that be?

It also had a field for "extra distance." What does that mean?
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  #136  
Old 02-28-2011, 04:26 PM
kake kake is offline
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Quote:
Originally Posted by UNIT View Post
Thanks for the information, kake. (Now I'm hearing that "Short Skirt, Long Jacket" song in my head.)

I went to that site and I plugged my glasses prescription in. It's -1.75 and the answer came back -1.75 in contact lenses too. How can that be?

It also had a field for "extra distance." What does that mean?
if your prescription is less than +/-4. the prescription doesn't change.

The distance is from ur pupil to the glasses' lens, since everyone's face shape is different.
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  #137  
Old 02-28-2011, 04:33 PM
VAB VAB is offline
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Quote:
Originally Posted by kake View Post
The distance is from ur pupil to the glasses' lens, since everyone's face shape is different.
So I guess that "extra distance" doesn't apply for contact lenses?
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  #138  
Old 03-09-2011, 10:52 PM
alvin alvin is offline
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Default help

Hi there, I also need help converting my eyeglasses prescription to contacts presciption.

My eyeglasses presciption
Right Eye:

SPH CYL AXIS
-1.50 -1.50 180


Left Eye:

SPH CYL AXIS
-1.25 -1.00 180


P.S I have astigmatism
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  #139  
Old 03-10-2011, 10:42 AM
RMDesigns RMDesigns is offline
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Smile pls help!

Hi everyone. New here. I wear contact lenses, mostly RGP's. I find that RGP's give me sharper vision than soft contacts, because of my astigmatism. The only downside to them is when you get dust they become very uncomfortable. I have to pop them out and wash them every time this happens. I have worn soft toric lenses for a couple of years but the clear vision I get from RGP's is not there. They are very comfortable but they do not last long and I can not wear them for more than 8 hours. Just recently I got a pair of prescription glasses made and I wanted a prescription for contacts too but my eye doctor was going to charge me 100 dollars just to convert my glasses prescription to soft contact lenses prescription. I would like a pair of soft contacts on the side for emergency. Is there anyone or any site out there that converts prescription glasses to soft contact lenses prescription? ( glasses prescription: -9.50 -1.50 x 180, -9.50 -1.00 x 15)
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  #140  
Old 03-12-2011, 06:11 PM
Patches Patches is offline
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Can anyone help me out? I don't really do math all that well lol

This is my glasses prescription:

OD -0.25 -1.00 x 70
OS -0.75 -1.00 x 100

can someone convert this to contacts for me?

thanks =)
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  #141  
Old 03-14-2011, 12:32 PM
ICU2 ICU2 is offline
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Quote:
Originally Posted by Patches View Post
Can anyone help me out? I don't really do math all that well lol

This is my glasses prescription:

OD -0.25 -1.00 x 70
OS -0.75 -1.00 x 100

can someone convert this to contacts for me?

thanks =)
Did you look at the formula at the top of this thread? If you "don't really do math all that well" it probably scared you didn't it?
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  #142  
Old 03-14-2011, 12:45 PM
Patches Patches is offline
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Quote:
Originally Posted by ICU2 View Post
Did you look at the formula at the top of this thread? If you "don't really do math all that well" it probably scared you didn't it?
terrified O_O
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  #143  
Old 03-14-2011, 01:29 PM
Anazak Anazak is offline
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Quote:
Originally Posted by Patches View Post
terrified O_O
I don't blame you. Unfortunately, I don't know how to convert glasses prescriptions to contact lens. I think I'd rather just have my eye doctor do it when go to get fitted. That kind of thing should be left to a professional. Besides, if I were to go to an eye doctor and say "Can you write my a prescription for contact lenses with these parameters?" he or she would have to check my eyes anyway.
There's no way I'd be able to go to a store and hand them the prescription that I figured out myself, and if I ordered them from Lens.com, they'd ask for a doctor's phone number so they can call him or her and verify that I didn't just calculate my own prescription, you know?

If you really want contact lenses, I'm afraid there's really no way to avoid seeing the doctor. It may be expensive, but it's the smartest way to go.
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  #144  
Old 03-28-2011, 04:39 PM
cc(,``o cc(,``o is offline
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after reading this thread i realized how easy it is we got things here. at least where checkups are concerned. checkups are free if we buy our prescription from that optical shop. if not the fee is like $5 (possibly less)

i found this:

If you have any astigmatism or require a lens power greater than +/-4.00, the parameters of the contact lens can change.

- if you have astigmatism under 0.50, a spherical lens should be prescribed.
- astigmatism of 0.50 to 0.75 can be effectively corrected with an aspheric lens.
- astigmatism greater than 1.00 should be managed with a toric lens.

If your prescription power for glasses is greater than +/-4.00, you should see a difference in the power of your contact lens prescription. Generally, every time your glasses prescription increases or decreases by a power of 2, your contact lens prescription will increase by an additional power of +0.25. For every power change of 2 in a glasses prescription, the difference of +0.25 power is needed to compensate for the location of the contact lens. Your glasses are much further from the front surface of the cornea than contact lenses.
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  #145  
Old 03-28-2011, 05:02 PM
NYGiants NYGiants is offline
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Quote:
Originally Posted by cc(,``o View Post
after reading this thread i realized how easy it is we got things here. at least where checkups are concerned. checkups are free if we buy our prescription from that optical shop. if not the fee is like $5 (possibly less)
Do you mean on Earth, where it says you're from?
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  #146  
Old 03-28-2011, 05:03 PM
cc(,``o cc(,``o is offline
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Quote:
Originally Posted by NYGiants View Post
Do you mean on Earth, where it says you're from?
errr....philippines i forgot about that. hey are you following my posts? LOL
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  #147  
Old 03-29-2011, 11:43 AM
Shade Maiden Shade Maiden is offline
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Default From the Philippines

Quote:
Originally Posted by cc(,``o View Post
errr....philippines i forgot about that. hey are you following my posts? LOL
I don't know about NYGiants, but I find it hard not to follow your posts. You've written a lot of them in a row, and I'm glad. It's nice to see someone so willing to participate. It's also nice to have another Filipino on board. I have some friends from the Philippines in my church. Great people. Do your ever order your contacts from the US, or do you always get them from home?
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  #148  
Old 03-29-2011, 11:49 AM
cc(,``o cc(,``o is offline
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Quote:
Originally Posted by Shade Maiden View Post
I don't know about NYGiants, but I find it hard not to follow your posts. You've written a lot of them in a row, and I'm glad. It's nice to see someone so willing to participate. It's also nice to have another Filipino on board. I have some friends from the Philippines in my church. Great people. Do your ever order your contacts from the US, or do you always get them from home?
errr....not exactly filipino:P but doesn't matter. i buy them at local optical shops. haven't gotten into the habit of buying online yet. not the most patient person. don't like waiting for things. lol

nice to meet you too shade maiden
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  #149  
Old 03-29-2011, 01:42 PM
321contacts 321contacts is offline
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Quote:
Originally Posted by cc(,``o View Post
errr....not exactly filipino:P but doesn't matter. i buy them at local optical shops. haven't gotten into the habit of buying online yet. not the most patient person. don't like waiting for things. lol

nice to meet you too shade maiden
So you're from the Philippines, but you're not Filipino? Or do you just live in the Philippines but you were born somewhere else?

As for buying things on line, I think a lot of people agree with you about waiting for things to arrive. At least your order and payment arrive there at the speed of light. Until Scotty comes along with his magic transporter beam, we have to rely on the postal service to bring our stuff.
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  #150  
Old 03-29-2011, 01:53 PM
cc(,``o cc(,``o is offline
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Quote:
Originally Posted by 321contacts View Post
So you're from the Philippines, but you're not Filipino? Or do you just live in the Philippines but you were born somewhere else?

As for buying things on line, I think a lot of people agree with you about waiting for things to arrive. At least your order and payment arrive there at the speed of light. Until Scotty comes along with his magic transporter beam, we have to rely on the postal service to bring our stuff.
well i am a filipino citizen but i am chinese by blood. i was just born and raised here.

still i am not into online shopping. one major is i do not have a credit card. i refuse to get one. i pay for everything cash. LOL
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  #151  
Old 04-05-2011, 11:34 AM
Eyeofthetiger Eyeofthetiger is offline
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Quote:
Originally Posted by cc(,``o View Post
I am not into online shopping. one major is i do not have a credit card. i refuse to get one. i pay for everything cash. LOL
I'm with you. I have a debit card to order stuff on line. Paying for everything in cash is a great idea. I tried going that route, but I discovered that there are some things best ordered on line. If you can pay for everything in cash, I would definitely recommend that.
Well, maybe ordering contact lenses from Lens.com could be your one exception.
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  #152  
Old 04-05-2011, 11:59 AM
cc(,``o cc(,``o is offline
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Quote:
Originally Posted by Eyeofthetiger View Post
I'm with you. I have a debit card to order stuff on line. Paying for everything in cash is a great idea. I tried going that route, but I discovered that there are some things best ordered on line. If you can pay for everything in cash, I would definitely recommend that.
Well, maybe ordering contact lenses from Lens.com could be your one exception.
there is a downside with debit cards unless you just put in the amount of money you need to use. otherwise it is dangerous in case someone gets hold of your information. hard to dispute those charges and will take time before your money will come back to you. whereas with credit cards those charges will be put on hold:P

i probably would if contacts plus shipping is still cheaper than getting it locally. but then i am already back to wearing eyeglasses. i am planning on getting refractive surgery so i bought a new pair of eyeglasses (haven't used glasses in 10yrs). the lens alone cost me $135 (it's the cheapest ) so decided to get my money's worth and use it already. might as well let my eyes rest longer.
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  #153  
Old 04-05-2011, 01:46 PM
SteveKemp SteveKemp is offline
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Default Wear `em If You Got `em

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Originally Posted by cc(,``o View Post
there is a downside with debit cards unless you just put in the amount of money you need to use. otherwise it is dangerous in case someone gets hold of your information. hard to dispute those charges and will take time before your money will come back to you. whereas with credit cards those charges will be put on hold:P

i probably would if contacts plus shipping is still cheaper than getting it locally. but then i am already back to wearing eyeglasses. i am planning on getting refractive surgery so i bought a new pair of eyeglasses (haven't used glasses in 10yrs). the lens alone cost me $135 (it's the cheapest ) so decided to get my money's worth and use it already. might as well let my eyes rest longer.
It's surprising how much glasses cost these days, isn't it? I agree that if you spent the money on those glasses, best thing is to wear them.
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  #154  
Old 04-05-2011, 01:51 PM
cc(,``o cc(,``o is offline
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Originally Posted by SteveKemp View Post
It's surprising how much glasses cost these days, isn't it? I agree that if you spent the money on those glasses, best thing is to wear them.
it sure is amazing. in my case it is more expensive than normal because i have a high prescription especially when it comes to astigmatism. -3.75 tsk tsk tsk. i just spent $200 on eyeglasses when lasik surgery here cost $1200 (both eyes already). certainly need to get my money's worth. lol
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  #155  
Old 04-05-2011, 04:36 PM
Juniorgerbil Juniorgerbil is offline
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Default Your Studied Opinion

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Originally Posted by cc(,``o View Post
it sure is amazing. in my case it is more expensive than normal because i have a high prescription especially when it comes to astigmatism. -3.75 tsk tsk tsk. i just spent $200 on eyeglasses when lasik surgery here cost $1200 (both eyes already). certainly need to get my money's worth. lol
You sound like someone who can spot a bargain. What do you think about the prices at Lens.com?
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  #156  
Old 04-05-2011, 05:42 PM
cc(,``o cc(,``o is offline
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Originally Posted by Juniorgerbil View Post
You sound like someone who can spot a bargain. What do you think about the prices at Lens.com?
i am having trouble making a comparison on contact lens because i have never used toric lenses then i have only used flex wear for the past 7 or so years which costs like $5/mo or $15 for the first a box then $12.50 for the succeeding boxes given that you buy the box in 3mos time. now the problem arise because i cannot find this particular brand on lens.com

the last time i bought an extended wear yearly contact lens was around 8-10yrs ago. it cost around $30-$40 a pair.
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  #157  
Old 04-08-2011, 11:46 AM
MaryTamm2 MaryTamm2 is offline
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Quote:
Originally Posted by cc(,``o View Post
i am having trouble making a comparison on contact lens because i have never used toric lenses then i have only used flex wear for the past 7 or so years which costs like $5/mo or $15 for the first a box then $12.50 for the succeeding boxes given that you buy the box in 3mos time. now the problem arise because i cannot find this particular brand on lens.com

the last time i bought an extended wear yearly contact lens was around 8-10yrs ago. it cost around $30-$40 a pair.
What brand is that? I'll see if I can find it. If someone else gets there first before me, that's okay too.
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  #158  
Old 04-08-2011, 07:48 PM
cc(,``o cc(,``o is offline
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Originally Posted by MaryTamm2 View Post
What brand is that? I'll see if I can find it. If someone else gets there first before me, that's okay too.
i forgot which line it was but i remember using sauflon and B&L contact lenses but this was years ago.

the most recent ones i have been using were the flex wear monthly contacts
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  #159  
Old 04-11-2011, 01:57 PM
Enah Enah is offline
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Originally Posted by cc(,``o View Post
i forgot which line it was but i remember using sauflon and B&L contact lenses but this was years ago.

the most recent ones i have been using were the flex wear monthly contacts
Have you checked our Wise and Wonderful Sponsor, Lens.com? Do they have those "flex wear monthly contacts" that you have been wearing? Just click the big red banner up at the top of the page.
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  #160  
Old 04-11-2011, 02:05 PM
cc(,``o cc(,``o is offline
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Have you checked our Wise and Wonderful Sponsor, Lens.com? Do they have those "flex wear monthly contacts" that you have been wearing? Just click the big red banner up at the top of the page.
i have checked and they don't i have even tried google
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  #161  
Old 04-12-2011, 10:02 AM
AmigaBonita AmigaBonita is offline
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Default Contact Lens Search

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Originally Posted by cc(,``o View Post
i have checked and they don't i have even tried google
What words did you search for in Google?
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  #162  
Old 04-12-2011, 10:28 AM
cc(,``o cc(,``o is offline
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Originally Posted by AmigaBonita View Post
What words did you search for in Google?
flex wear of course. what else would i be searching about? i was able to find the name of the optical shop and the maker but nothing other than that. it's also not in the list on lens.com
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  #163  
Old 04-12-2011, 01:28 PM
Anthanxan Anthanxan is offline
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Originally Posted by cc(,``o View Post
flex wear of course. what else would i be searching about? i was able to find the name of the optical shop and the maker but nothing other than that. it's also not in the list on lens.com
I found something called "CV 43 Flex Wear" contact lenses by Cooper Vision, but they've been discontinued.
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  #164  
Old 04-12-2011, 01:31 PM
cc(,``o cc(,``o is offline
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Quote:
Originally Posted by Anthanxan View Post
I found something called "CV 43 Flex Wear" contact lenses by Cooper Vision, but they've been discontinued.
i've attached a photo of the ones i usually buy
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  #165  
Old 04-17-2011, 08:30 PM
lace_72 lace_72 is offline
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Default Help

I was just wondering if any one could help me with a conversion. I had an eye glass exam a few months ago and was gonna go back for a contact exam but I ended up moving with out much notice for a job. None of the doctors in my new state will help me because my prescription is more than two months old. Moving across country is kinda pricey and I would love to save some $ if I could. I have worn contacts before and I am accustom to Acuvue Advance for Astigmatism. If any one could help that would be amazing.

Right: Sphere -1.25, Cyl -2.00, Axis 170

Left: Sphere _1.25, Cyl -1.75, Axis 180
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  #166  
Old 04-18-2011, 12:10 PM
Bondjamesbond Bondjamesbond is offline
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Quote:
Originally Posted by lace_72 View Post
I was just wondering if any one could help me with a conversion. I had an eye glass exam a few months ago and was gonna go back for a contact exam but I ended up moving with out much notice for a job. None of the doctors in my new state will help me because my prescription is more than two months old. Moving across country is kinda pricey and I would love to save some $ if I could. I have worn contacts before and I am accustom to Acuvue Advance for Astigmatism. If any one could help that would be amazing.

Right: Sphere -1.25, Cyl -2.00, Axis 170

Left: Sphere _1.25, Cyl -1.75, Axis 180
Hi lace_72. I'm sorry you're having a problem getting contact lenses. The trouble is that converting a glasses prescription to a contact lens one is rather complicated. It's not a matter of adding three to each number and then dividing by two or something.
In fact, someone has already asked about conversion and it sparked a thread that's about 100 posts long!

If you'd like to read it, grab a snack and find a comfy chair. Here's the link:

http://www.lens101.com/general-contact-lens-care-questions/3599-converting-glasses-prescription-into-contact-lens-prescription.html
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  #167  
Old 04-18-2011, 02:05 PM
Raidernation11 Raidernation11 is offline
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Default What's Up?

Quote:
Originally Posted by crxchicky View Post
Thanks so much knotlob...
I think Im ready to order
What's the latest, crxchicky? Did you order those lenses yet?
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  #168  
Old 04-19-2011, 06:42 PM
cheerstunt11 cheerstunt11 is offline
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Default Helppppp!

Im honestly sick of wearing glasses, I would love it if someone could convert my eyeglass prescription into a contact prescription.
OD: -2.25 5ph
OS: -2.25-.25x85
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  #169  
Old 04-21-2011, 02:46 AM
Ms. Breck Ms. Breck is offline
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Hello. Can someone please help me out. I suck at math and that formula is definately scary lol. My glass prescription is..

O.D. -425 -125 175

O.S. -425 -100 005

Could you please help me out? Your help will be greatly appreciated. Thanks in advance.
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  #170  
Old 04-21-2011, 08:32 AM
rfknight rfknight is offline
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Quote:
Originally Posted by Ms. Breck View Post
Hello. Can someone please help me out. I suck at math and that formula is definately scary lol. My glass prescription is..

O.D. -425 -125 175

O.S. -425 -100 005

Could you please help me out? Your help will be greatly appreciated. Thanks in advance.
Converted for vertex distance (I used a standard assumption of a vertex distance of 12mm) the prescription is:

O.D. -4.00 -1.12 175
O.S. -4.00 -1.00 005
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  #171  
Old 04-25-2011, 04:39 PM
321contacts 321contacts is offline
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Quote:
Originally Posted by rfknight View Post
Converted for vertex distance (I used a standard assumption of a vertex distance of 12mm) the prescription is:

O.D. -4.00 -1.12 175
O.S. -4.00 -1.00 005
How did you do that, rfknight? Try not to scare Ms. Breck when you explain in though.
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  #172  
Old 05-12-2011, 04:47 PM
nlava nlava is offline
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Hi all,

I'm so glad that I found this thread. I want to purchase contacts again after not wearing them for a year and losing the previous box.

my current spectacle prescription is as follows:

OD: -6.25 -1.00 x 20
OS: -6.50 -0.75 x 173

Can someone please help me convert this into contact prescription?

Thank you so much!
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  #173  
Old 05-12-2011, 08:41 PM
Chosen14u Chosen14u is offline
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Could someone please help convert this for me, my math is of only grade 11 math and that just looks like mumble jumble to me and the online conversions just don't seem to work properly, fields missing and popups not working..

OD: SPH=-0.50 CYL=-0.50 AXIS=100

OS: SPH=-0.75 CYL=-0.50 AXIS=125

Regards
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  #174  
Old 05-13-2011, 08:41 AM
rfknight rfknight is offline
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Quote:
Originally Posted by nlava View Post
Hi all,

I'm so glad that I found this thread. I want to purchase contacts again after not wearing them for a year and losing the previous box.

my current spectacle prescription is as follows:

OD: -6.25 -1.00 x 20
OS: -6.50 -0.75 x 173

Can someone please help me convert this into contact prescription?

Thank you so much!
This one turns out to be:
OD -5.87 -0.75 x 20
OS -6.00 -0.62 x 173



"Could someone please help convert this for me, my math is of only grade 11 math and that just looks like mumble jumble to me and the online conversions just don't seem to work properly, fields missing and popups not working..

OD: SPH=-0.50 CYL=-0.50 AXIS=100

OS: SPH=-0.75 CYL=-0.50 AXIS=125 "

This one does not require conversion. Only powers greater than or equal to +/- 4.00 need vertex distance compensation.
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  #175  
Old 05-13-2011, 08:51 AM
NYGiants NYGiants is offline
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Default 11th Grade, Huh?

Quote:
Originally Posted by Chosen14u View Post
Could someone please help convert this for me, my math is of only grade 11 math . . .
I wish my math was as good as yours!
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  #176  
Old 05-13-2011, 09:12 AM
Chosen14u Chosen14u is offline
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Default thanks

Thanks for the help.

gonna buy some off of Clearlycontacts.
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  #177  
Old 05-13-2011, 10:59 AM
FirstDown FirstDown is offline
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Quote:
Originally Posted by Chosen14u View Post
Thanks for the help.

gonna buy some off of Clearlycontacts.
I'm glad we could help you. What kind of contacts are you going to buy now?
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  #178  
Old 05-13-2011, 11:19 AM
Chosen14u Chosen14u is offline
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Quote:
Originally Posted by FirstDown View Post
I'm glad we could help you. What kind of contacts are you going to buy now?
a good friend of mine is using Extreme H2O 59% Xtra, he hasn't had any issues with them figured I'd see how they are.
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  #179  
Old 05-16-2011, 04:40 PM
PeriBrown PeriBrown is offline
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Default Save Some Money

Quote:
Originally Posted by Chosen14u View Post
a good friend of mine is using Extreme H2O 59% Xtra, he hasn't had any issues with them figured I'd see how they are.
You can buy them from Lens.com and save some money. How does $25.95 for a box of six lenses sound? That's less than the price of $29.89 I found on Clearly Contacts.

http://www.lens.com/contact-lenses/lens409.asp
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  #180  
Old 05-18-2011, 01:52 PM
AmigaBonita AmigaBonita is offline
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Default Have You Chosen Some Contacts Yet?

Quote:
Originally Posted by Chosen14u View Post
a good friend of mine is using Extreme H2O 59% Xtra, he hasn't had any issues with them figured I'd see how they are.
Did you order those contact lenses yet, Chosen14u?
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  #181  
Old 05-25-2011, 09:31 AM
Chosen14u Chosen14u is offline
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Quote:
Originally Posted by AmigaBonita View Post
Did you order those contact lenses yet, Chosen14u?
I did and I currently have them in, they I think definitely take some time to adjust to.

I got a BC of 8.6 I figured was a good average size, but thinking I should probably get fitted for a proper size maybe.. so far these are ok..
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  #182  
Old 05-25-2011, 09:39 AM
RawBob RawBob is offline
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Default Are You Kidding?

Quote:
Originally Posted by Chosen14u View Post
I did and I currently have them in, they I think definitely take some time to adjust to.

I got a BC of 8.6 I figured was a good average size, but thinking I should probably get fitted for a proper size maybe.. so far these are ok..
Say what? You got contact lenses by just guessing your base curve? How is that possible? I thought that when you ordered contact lenses you had to give them a copy of your prescription along with your doctor's phone number so that they can call and confirm.

You should definitely get fitted professionally for your contact lenses--always.
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  #183  
Old 05-27-2011, 05:12 PM
al-Michiko al-Michiko is offline
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Hi all,

I read this thread but still I don't understand and cannot convert my current glasses prescription into contacts prescription! *_*

Can someone help me please to convert my current glasses prescription?

R: sph -5.50 cyl -0.50 axis 55.0
L: sph -5.00 cyl -0.50 axis 115.0


Are the cyl and axis important when buying contacts?

Previously I bought contacts with this prescription (old one):

R: BC 8.6 DIA 14.2 PWR -5.00
L: BC 8.6 DIA 14.2 PWR -4.75

What are BC and DIA? How I determine that in when I want to buy contacts?

Thanks in advance!
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  #184  
Old 06-01-2011, 02:40 PM
JTKirk JTKirk is offline
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Quote:
Originally Posted by al-Michiko View Post
Hi all,

Are the cyl and axis important when buying contacts?

Previously I bought contacts with this prescription (old one):

R: BC 8.6 DIA 14.2 PWR -5.00
L: BC 8.6 DIA 14.2 PWR -4.75

What are BC and DIA? How I determine that in when I want to buy contacts?

Thanks in advance!
I'm not good at math so I'll address the second part of your post.

Cylinder and axis are contact lens measurements if you have astigmatism. These two measurements correct for that blur.

BC and DIA stand for "base curve" and "diameter" and are sizes of contact lenses. You may have noticed that contact lenses are curved, like a bowl. The base curve measures how steep the sides of the bowl are. Diameter is the same as the diameter of any circle. It's the distance from one edge to the opposite edge. When you get fitted for contact lenses by your doctor they will give you a prescription that has the power, base curve and diameter you need for the most comfortable and effective contact lenses.
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  #185  
Old 06-06-2011, 06:14 PM
txmade txmade is offline
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Default Help!!!!

i went to eye exam but decided 2 go 4 contacts, if some1 here can convert my RX i would really appreciate it it reads: right eye- SPH -4.00 CYL +0.50 AXIS (maybe x) + 85 left eye- SPH -4.75 CYL +1.50 AXIS (maybe x) +85 i say (maybe x) Because doc handwriting is confusing plz help anyone???
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  #186  
Old 06-08-2011, 12:09 PM
Spongebob Spongebob is offline
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Quote:
Originally Posted by txmade View Post
i went to eye exam but decided 2 go 4 contacts, if some1 here can convert my RX i would really appreciate it it reads: right eye- SPH -4.00 CYL +0.50 AXIS (maybe x) + 85 left eye- SPH -4.75 CYL +1.50 AXIS (maybe x) +85 i say (maybe x) Because doc handwriting is confusing plz help anyone???
That looks like a contact lens prescription to me. Do you want someone to convert it to a prescription for spectacles?
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  #187  
Old 06-12-2011, 12:53 AM
keekah keekah is offline
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Hii. New here. I currently wear glasses but my wedding is in a month and everyone keeps telling me I need to get contacts. I have never worn contacts or have I ever gotten a prescription for them. I will most likely go in for an exam and just use the trial pair at my wedding and never get contact for everyday use. But I was just curious as to what my prescription would be because I know I have an astigmatism in both eyes. I also think it would be neat to compare once I got my actual prescription. My glasses prescription is:

Right Eye: -Sph 0.00, Cyl -3.25, Axis 175
Left Eye: -Sph -1.00, Cyl -1.50, Axis 40

Thanks in advance.
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  #188  
Old 06-12-2011, 09:37 AM
lurker2010 lurker2010 is offline
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Quote:
Originally Posted by keekah View Post
Hii. New here. I currently wear glasses but my wedding is in a month and everyone keeps telling me I need to get contacts. I have never worn contacts or have I ever gotten a prescription for them. I will most likely go in for an exam and just use the trial pair at my wedding and never get contact for everyday use. But I was just curious as to what my prescription would be because I know I have an astigmatism in both eyes. I also think it would be neat to compare once I got my actual prescription. My glasses prescription is:

Right Eye: -Sph 0.00, Cyl -3.25, Axis 175
Left Eye: -Sph -1.00, Cyl -1.50, Axis 40

Thanks in advance.
Forget about it. People normally see you with glasses? That's the way you want your photos to look.

Your right eye requires a cyl correction of -3.25. Very few toric lenses are available in that parameter. I'm not even sure a month is long enough to get fitted. It's unlikely an eye doctor would even have trial lenses in his office that script. Good chance they'd have to be ordered. They might even be manufactured to order, which means it would take few weeks. My guess is you can see well enough without any eye correction to enjoy your wedding, should you not want to wear glasses.
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  #189  
Old 06-13-2011, 09:22 AM
timetraveler timetraveler is offline
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Quote:
Originally Posted by keekah View Post
Hii. New here. I currently wear glasses but my wedding is in a month and everyone keeps telling me I need to get contacts. I have never worn contacts or have I ever gotten a prescription for them. I will most likely go in for an exam and just use the trial pair at my wedding and never get contact for everyday use. But I was just curious as to what my prescription would be because I know I have an astigmatism in both eyes. I also think it would be neat to compare once I got my actual prescription. My glasses prescription is:

Right Eye: -Sph 0.00, Cyl -3.25, Axis 175
Left Eye: -Sph -1.00, Cyl -1.50, Axis 40

Thanks in advance.
I think lurker2010 is right in that a month is not very much time to be fitted for contacts, especially with all the other preparations that will need to be made. It wouldn't hurt to call around to see if someone can get you into a pair of contact lenses by July.
There aren't a lot of toric lenses available in the -3.25 cylinder, but it looks like Optima Toric is one of them, BUT . . .

"Please note: Due to changes in consumer demand, manufacturer (Bausch & Lomb) implemented a made-to-order process for Optima Toric which requires a 21-day lead time to fulfill the order. You should expect to receive this product 5-6 weeks after the order date."

That's just because of "changes in consumer demand" for Optima Toric. Why don't you call Lens.com at 1-800 LENS.COM (536-7266) or email them at Service@Lens.com and see what they can do. Let us know, okay?

As for the glasses, I don't think it will ruin your wedding if you wear them. You might even ask all of your guests to wear glasses.
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  #190  
Old 06-13-2011, 09:45 AM
cc(,``o cc(,``o is offline
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do you really need to get your exact grade? generally the idea is that eyeglass prescription should be lowered a bit to compensate for the contacts covering the eyes directly instead of being about an inch away from your eye.

then generally my experience with my optometrist is that they seem to prefer to give me a prescription that is slightly under my grade. their reason being is that the next time i need to upgrade i don't directly to the higher prescription.

my prescription is rather bad at
right -5.25 sph -3.75 cyl
left -6.00 sph -3.75 cyl

i have since gone back to eyeglasses but when i need to i make do with -8.00 contacts (to the bane of my optometrist). i know this is bad and not really advisable but i find this to be ok enough to see in general. this gives me 20/40 vision.
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  #191  
Old 06-13-2011, 10:22 AM
keekah keekah is offline
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Thanks for the reply guys. I never realized it took so long to get fitted for contacts. But I have a question. Some people on here have been adding half of their cylinder to their sphere. How would this compensate for the cylinder? And is that a possible option for me? And my original question never really got answered. Is my contact lens prescription the same as my glasses prescription?
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  #192  
Old 06-13-2011, 11:23 AM
Anazak Anazak is offline
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Quote:
Originally Posted by keekah View Post
Thanks for the reply guys. I never realized it took so long to get fitted for contacts. But I have a question. Some people on here have been adding half of their cylinder to their sphere. How would this compensate for the cylinder? And is that a possible option for me? And my original question never really got answered. Is my contact lens prescription the same as my glasses prescription?
Converting a glasses prescription to a contact lens prescription isn't that simple. It's like converting Fahrenheit to Celsius. It's not just a matter of adding three or something. Adding half of the cylinder for the sphere might work for one prescription, but certainly not for all.
It's also extremely rare for a contact lens prescription to match the glasses. For all practical purposes, that never happens. So the best thing to do would be to go to your eye doctor and say "I need contact lenses for my wedding that's a month away, can we do that?" Hopefully you can get in to see your doctor in less than a month. Like timetraveler said, you've also got to think about rehearsals, ordering the food, getting the band lined up, planning the pyrotechnics, booking the celebrity guests, blah, blah, blah. I think at this point you may have to consider the possibility of getting married in your glasses. That won't be the end of the world, will it?
In any case, I wish you wedding blessings. Will you show us pictures?
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  #193  
Old 06-14-2011, 08:35 AM
lurker2010 lurker2010 is offline
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Your contact lens script isn't the same as your glasses. A contact lens script includes the exact brand of lens, base curve, diameter as well as the lens parameters.

The parameters aren't necessarily the same for contacts and spectacles. The eye doctor starts with a conversion formula/ calculator but your final script will be based on how the lens works for you.

I put your script in a calculator. Your -3.25 cylinder suggests a contact lens of -3.25 cylinder. That lens is unlikely to be a stock trial lens.

If you want to wear contacts for your wedding, I think it's a mistake, you need to stop asking on the internet and start looking for an eye doctor. Many (most?) doctors charge more when fitting toric lenses.
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  #194  
Old 06-14-2011, 08:49 AM
Sk8erBoi Sk8erBoi is offline
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Default Go For It

Quote:
Originally Posted by lurker2010 View Post
If you want to wear contacts for your wedding, I think it's a mistake, you need to stop asking on the internet and start looking for an eye doctor. Many (most?) doctors charge more when fitting toric lenses.
Lurker2010 is right. I think it's time to make some phone calls and visit some eye doctors in town. They'll know much better than we do. Who knows? You may find a really helpful doctor who will go above and beyond, but you won't know until you start talking to doctors' offices. Good luck.
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  #195  
Old 06-17-2011, 03:47 PM
thebrandons07 thebrandons07 is offline
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Default can u help me

Wat would my contact prescription be if my glasses prescription is left eye 1.25 and my right is 1.00



Pls and thank you




Quote:
Originally Posted by Sir Robin View Post
There is a formula, it is normally only an issue if you have a prescription greater than =/-4.00
Fcl = Fsp * (1 - (d/Fsp)
Fcl = 1/contact lens power in diopters ie -6.00= -0.167
Fsp = 1/spectacle lens power in diopters ie -6.50= -0.154
d = distance from the eye to the spectacle lens in meters usually 12mm = 0.012
So an example would be, using the numbers above
A spherical eyeglass prescription of -6.50 so

Fcl = -0.154 * (1 - (0.012/-0.154))

-6.02 = -0.154 * 1.078
= -6.00
You round to the nearest 0.25, there are charts that are much easier.
If you have astigmatism you have to figure that in as well. If the direction of your astigmatism is say 145 there are very few contact lenses that would come in that direction so you would have to go to a 140 or a 150 even then some do not come in those directions. If you have say -1.50 of astigmatism you will usually not find any contacts that come in that power either, usually -1.25 or -1.75.
And none of this takes into account the fit of the contact lens.
I found the formula on Wikipedia if anyone wants to do a little recreational math, then used the charts I mentioned to work out how to get it to work.
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  #196  
Old 06-17-2011, 04:11 PM
MillersLastChance MillersLastChance is offline
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Default

Quote:
Originally Posted by thebrandons07 View Post
Wat would my contact prescription be if my glasses prescription is left eye 1.25 and my right is 1.00



Pls and thank you
Are you as scared of that formula as I am? That one says "it is normally only an issue if you have a prescription greater than =/-4.00." Since your prescription is only 1.25 at the most, that formula probably won't work so well. Does anyone have a simpler conversion formula?
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  #197  
Old 06-17-2011, 04:15 PM
thebrandons07 thebrandons07 is offline
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Oh yes def im so confused
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  #198  
Old 06-28-2011, 11:30 AM
Tradecade Tradecade is offline
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Quote:
Originally Posted by thebrandons07 View Post
Oh yes def im so confused
If you found that answer confusing, maybe you should just see your eye doctor. I'm afraid that Sir Robin's posting of the formula is not very helpful if 9 x 9 is about as complex an equation as you can handle. That would be my math skill level.

Perhaps someone who isn't as mathematically challenged as I am could plug in the numbers for you.
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  #199  
Old 06-30-2011, 09:50 AM
SandiB SandiB is offline
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Hi, I was hoping someone might be able to help me.

Last year I received a prescription for contacts that gave me headaches. It was:

R sphere -2.5
R base curve 8.4
diameter 14.0

L sphere - 2.5
L base curve 8.4
diameter 14.0


I mentioned this to my new optometrist when I went in for an appointment. She said that my "axis is way off, which is causing [me] to see the world at an angle." She gave me a new glasses prescription and a sample of contacts to try out.

I swore I had saved the box, for reference, and I cannot find them now.

My *new* glasses prescription is as follows:

Right

Sphere -2.00
Cyl -0.75
Axis 085

Left

Sphere -2.25
Cyl -0.25
Axis 105

This is the GOOD prescription, but I don't know how to ascertain the contact prescription from it. I've called and she said she didn't write it down and doesn't know what it is. I'd have to schedule another appointment. :/

Thanks for any help.
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  #200  
Old 06-30-2011, 02:04 PM
mamabear1 mamabear1 is offline
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Default

Quote:
Originally Posted by SandiB View Post
Hi, I was hoping someone might be able to help me.

Last year I received a prescription for contacts that gave me headaches. It was:

R sphere -2.5
R base curve 8.4
diameter 14.0

L sphere - 2.5
L base curve 8.4
diameter 14.0


I mentioned this to my new optometrist when I went in for an appointment. She said that my "axis is way off, which is causing [me] to see the world at an angle." She gave me a new glasses prescription and a sample of contacts to try out.

I swore I had saved the box, for reference, and I cannot find them now.

My *new* glasses prescription is as follows:

Right

Sphere -2.00
Cyl -0.75
Axis 085

Left

Sphere -2.25
Cyl -0.25
Axis 105

This is the GOOD prescription, but I don't know how to ascertain the contact prescription from it. I've called and she said she didn't write it down and doesn't know what it is. I'd have to schedule another appointment. :/

Thanks for any help.
I only wish that converting a glasses prescription to a contact lens prescription was as easy as just multiplying by 3.36 or something, but there's more to it than that, as you can see from the incredibly long formula above. Honestly, if you want to know what your contact lens prescription would be, the best person to ask would be your eye doctor. This is a very informative site, but it's not terribly active. You could wait weeks for the right person to come along and do your calculations for you. You're probably going to wind up scheduling another appointment.
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Contact Lenses

/ Contact Lens Forums
Daily Disposable Contact Lenses 2
1-2 Week Disposable Contact Lenses
Monthly Disposable Contact Lenses
Color Contact Lenses 2 3 4 5 6 7
Gas Permeable Contact Lenses 2 3
Toric Contact Lenses 2 3
Bifocal Contact Lenses 2
Vial Contact Lenses
Other Contact Lenses 2 3, & Contact Lens Care 2 3 4 5 6 7 8 9 10 11

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