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Converting a Glasses Prescription into a Contact Lens Prescription

This is a discussion on Converting a Glasses Prescription into a Contact Lens Prescription within the General Contact Lens Care and Questions forums; Can someone tell me what my contact lens prescription would be based on my following ...


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  #201 (permalink)  
Old 07-09-2011, 02:29 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
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Default convert glasses prescription to contact lens

Can someone tell me what my contact lens prescription would be based on my following glasses one? (mainly for reading)

Sphere Cylinder Axis
Right -0.50 -025 125.0
Left -1.25 -025 175.0

Distance acuity Near Acuity
Right 6/6 n6
Left 6/9-2 n6
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  #202 (permalink)  
Old 07-13-2011, 04:59 AM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
Posts: 2
Default

As a rough guide, my old contact lens prescription last year was -4.00 / 2.75 x 180 for both eyes.

However, my glasses prescription has since changed to
R: S-3.25 / C-3.75 x 10
L: S-4.00 / C-3.50 x 175


Would be great if someone could help me convert my glasses prescription to contact lens! My optician is in Malaysia and I'm leaving tmr for studies in Australia and I forgot to ask for my contact lens prescription.

PS: the contact lens I will be ordering carries spherical power up to -10.00 (in 0.25 steps) and cylindrical power up to -4.00 (in 0.50 steps) with BC of 8.6.


THANK YOU in advance!
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  #203 (permalink)  
Old 07-13-2011, 08:55 AM
Contact Lenses Forum - Bachelors Degree
 
Join Date: Nov 2007
Posts: 597
Default Scroll Up

Quote:
Originally Posted by kimli View Post
As a rough guide, my old contact lens prescription last year was -4.00 / 2.75 x 180 for both eyes.

However, my glasses prescription has since changed to
R: S-3.25 / C-3.75 x 10
L: S-4.00 / C-3.50 x 175


Would be great if someone could help me convert my glasses prescription to contact lens! My optician is in Malaysia and I'm leaving tmr for studies in Australia and I forgot to ask for my contact lens prescription.

PS: the contact lens I will be ordering carries spherical power up to -10.00 (in 0.25 steps) and cylindrical power up to -4.00 (in 0.50 steps) with BC of 8.6.


THANK YOU in advance!
Will we still hear from you in Australia?

Seriously. This thread has over two hundred posts in it, and none of them help you make the conversion?
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  #204 (permalink)  
Old 07-13-2011, 09:41 AM
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Join Date: Jul 2011
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Default

Quote:
Originally Posted by Petra View Post
Will we still hear from you in Australia?

Seriously. This thread has over two hundred posts in it, and none of them help you make the conversion?
Nope. Scrolled through most of the replies already. No one has astigmatism power as high as mine. Could have done the conversion myself if I have only myopia and non/low astig.
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  #205 (permalink)  
Old 07-13-2011, 11:20 AM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 277
Default I'm Not a Math Wiz

Quote:
Originally Posted by kimli View Post
As a rough guide, my old contact lens prescription last year was -4.00 / 2.75 x 180 for both eyes.

However, my glasses prescription has since changed to
R: S-3.25 / C-3.75 x 10
L: S-4.00 / C-3.50 x 175


Would be great if someone could help me convert my glasses prescription to contact lens! My optician is in Malaysia and I'm leaving tmr for studies in Australia and I forgot to ask for my contact lens prescription.

PS: the contact lens I will be ordering carries spherical power up to -10.00 (in 0.25 steps) and cylindrical power up to -4.00 (in 0.50 steps) with BC of 8.6.


THANK YOU in advance!
Don't look at me. My checkbook's a mess and that's just simple plus and minus.
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  #206 (permalink)  
Old 07-15-2011, 06:40 AM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
Posts: 4
Default

Hey guys,

So if my glasses prescription is :

Sphere (SPH) Cylinder (CYL) Right eye -4.00 -0.50 5
Left eye -3.25 -0.50 180

Would i be correct to assume that as my SPH is not greater then -/+ 4 this part would stay the same

and that as my astigmatism is less then 0.75 I could get away with standard lenses rather then Torics (which are way more expensive!!)

or am I being a bit simplistic...

thanks all
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  #207 (permalink)  
Old 07-15-2011, 12:39 PM
Contact Lenses Forum - Senior
 
Join Date: Jan 2010
Posts: 367
Default

The US, and many other countries require a contact lens script. NOT a spectacle script converted by the customer.

Generally an eye practioner, as part of the exam, will give you several trial lenses to take home.

It would be safe to say, in part due to your astigmatism, you might wind up trying lenses which are slightly stronger, or slightly weaker, then you eyeglass script. It's possible, probably likely, your eye doctor will be able to find a non-toric lens which will work OK for you. You might need to try more then one brand.

HOWEVER do you plan on wearing your contacts every day or just for special occasions?

For every day wear you might find toric lenses give you the best vision.

A contact lens script includes the exact brand, base curve and lens diameter. You need more then just a conversion.

IF IT WAS SAFE AND LEGAL to dispense contacts based on a spectacle script then the internet vendors would be allowed to accept your spectacle script.

Assume as a "do it yourselfer" you wind up buying 3 or 4 different boxes of lenses (different brand/ parameters) before you find the right script. Paying for an exam might not even cost much more, most doctors will give you as many different trial lenses as it takes.


Quote:
Originally Posted by Jemma View Post
Hey guys,

So if my glasses prescription is :

Sphere (SPH) Cylinder (CYL) Right eye -4.00 -0.50 5
Left eye -3.25 -0.50 180

Would i be correct to assume that as my SPH is not greater then -/+ 4 this part would stay the same

and that as my astigmatism is less then 0.75 I could get away with standard lenses rather then Torics (which are way more expensive!!)

or am I being a bit simplistic...

thanks all

Last edited by lurker2010; 07-15-2011 at 01:59 PM..
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  #208 (permalink)  
Old 07-15-2011, 01:45 PM
Contact Lenses Forum - Bachelors Degree
 
Join Date: Dec 2007
Posts: 400
Default

Quote:
Originally Posted by lurker2010 View Post
The US, and many other countries require a contact lens script. NOT a spectacle script converted by the customer.

Generally an eye practioner, as part of the exam, will give you several trial lenses to take home.

It would be safe to say, in part due to your astigmatism, you might wind up trying lenses which are slightly stronger, and slightly weaker, then you eyeglass script. It's possible, probably likely, your eye doctor will be able to find a non-toric lens which will work OK for you. You might need to try more then one brand.

HOWEVER do you plan on wearing your contacts every day or just for special occasions?

For every day wear you might find toric lenses give you the best vision.

A contact lens script includes the exact brand, base curve and lens diameter. You need more then just a conversion.

IF IT WAS SAFE AND LEGAL to dispense contacts based on a spectacle script then the internet vendors would be allowed to accept your spectacle script.

Assume as a "do it yourselfer" you wind up buying 3 or 4 different boxes of lenses (different brand/ parameters) before you find the right script. Paying for an exam might not even cost much more, most doctors will give you as many different trial lenses as it takes.
Thank you for explaining all that, lurker2010. What you say makes a lot of sense, which seems to be the case quite often. I'm glad you joined us.
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  #209 (permalink)  
Old 07-15-2011, 02:10 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
Posts: 4
Default

Quote:
Originally Posted by lurker2010 View Post
The US, and many other countries require a contact lens script. NOT a spectacle script converted by the customer.

Generally an eye practioner, as part of the exam, will give you several trial lenses to take home.

It would be safe to say, in part due to your astigmatism, you might wind up trying lenses which are slightly stronger, or slightly weaker, then you eyeglass script. It's possible, probably likely, your eye doctor will be able to find a non-toric lens which will work OK for you. You might need to try more then one brand.

HOWEVER do you plan on wearing your contacts every day or just for special occasions?

For every day wear you might find toric lenses give you the best vision.

A contact lens script includes the exact brand, base curve and lens diameter. You need more then just a conversion.

IF IT WAS SAFE AND LEGAL to dispense contacts based on a spectacle script then the internet vendors would be allowed to accept your spectacle script.

Assume as a "do it yourselfer" you wind up buying 3 or 4 different boxes of lenses (different brand/ parameters) before you find the right script. Paying for an exam might not even cost much more, most doctors will give you as many different trial lenses as it takes.
Funnily enough I am an adult and don't need to be spoken to like a child. Could you get any more condescending?
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  #210 (permalink)  
Old 07-15-2011, 02:19 PM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 349
Default Let's Try Again

Quote:
Originally Posted by Jemma View Post
Funnily enough I am an adult and don't need to be spoken to like a child. Could you get any more condescending?
Sorry about that Jemma.

Your question was about using spherical lenses if your prescription isn't very severe in the cylinder parameter, is that correct? Would doing that be economically advantageous to you?
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  #211 (permalink)  
Old 07-16-2011, 10:48 AM
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Join Date: Jan 2010
Posts: 367
Default

Quote:
Originally Posted by Jemma View Post
Funnily enough I am an adult and don't need to be spoken to like a child. Could you get any more condescending?
No problem.

People who live in the US need a doctors script for contact lenses.

Some posters in lens101 live in countries where such a script isn't required.
Do you live in such a country? If so try google. You'll find several "calculators" which will convert a spectacle script to a contact lens script.

People who are too lazy or too stupid to find such a calculator on their own have no business being their own eye doctor, even if they live in a country where it's permitted.

To directly answer your question. An exam with trial lenses will determine if you can get vision which is "good enough" without paying for toric lenses.

You asked if you're question is "simplistic".

You're being more then a little simple if you think posters an an internet board are a better source of information then an eye professional who exams you.
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  #212 (permalink)  
Old 07-16-2011, 12:56 PM
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Join Date: Jul 2011
Posts: 4
Default

Quote:
Originally Posted by lurker2010 View Post
No problem.

People who live in the US need a doctors script for contact lenses.

Some posters in lens101 live in countries where such a script isn't required.
Do you live in such a country? If so try google. You'll find several "calculators" which will convert a spectacle script to a contact lens script.

People who are too lazy or too stupid to find such a calculator on their own have no business being their own eye doctor, even if they live in a country where it's permitted.

To directly answer your question. An exam with trial lenses will determine if you can get vision which is "good enough" without paying for toric lenses.

You asked if you're question is "simplistic".

You're being more then a little simple if you think posters an an internet board are a better source of information then an eye professional who exams you.
That answers my question. You can get even more condescending!
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  #213 (permalink)  
Old 07-16-2011, 01:01 PM
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Join Date: Jul 2011
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Default

Quote:
Originally Posted by Delta88 View Post
Sorry about that Jemma.

Your question was about using spherical lenses if your prescription isn't very severe in the cylinder parameter, is that correct? Would doing that be economically advantageous to you?
Yes it would be a lot cheaper not to have to get torics, and money is tight. I was given them in the past (long time ago)

I'd rather just try standard lenses as it would only be for occasions so I would not mind non perfect vision
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  #214 (permalink)  
Old 07-18-2011, 07:48 AM
Contact Lenses Forum - Senior
 
Join Date: Jan 2010
Posts: 367
Default

Quote:
Originally Posted by Jemma View Post
That answers my question. You can get even more condescending!
My comments were directed to many recent posters in this thread. I quoted your post because I thought the point is particularly relevant to you. You want to avoid purchasing toric lenses. Trial and error will determine what power and what lens material will best compensate for your astigmatism.

You need to tell your eye doctor when you intend to wear your contacts. Driving? At the computer? Weekends at clubs? Vacation?

I don't know what's more disturbing. Posters who think the internet can replace the need for a professional contact lens exam or posters who select a doctor who is so bad the internet gives them better info.

You want to get your "monies worth" Ask for a couple of boxes of sample solutions and some extra trial lenses.
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  #215 (permalink)  
Old 07-18-2011, 08:58 AM
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Join Date: Dec 2007
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Default

Quote:
Originally Posted by lurker2010 View Post
My comments were directed to many recent posters in this thread. I quoted your post because I thought the point is particularly relevant to you. You want to avoid purchasing toric lenses. Trial and error will determine what power and what lens material will best compensate for your astigmatism.

You need to tell your eye doctor when you intend to wear your contacts. Driving? At the computer? Weekends at clubs? Vacation?

I don't know what's more disturbing. Posters who think the internet can replace the need for a professional contact lens exam or posters who select a doctor who is so bad the internet gives them better info.

You want to get your "monies worth" Ask for a couple of boxes of sample solutions and some extra trial lenses.
I think Lurker2010's answer was a very good one. There was some good advice there about what to tell your eye doctor.

Lens 101 is a good site. There are a lot of people here who are pretty smart. I can't recall a time when someone posted something monumentally stupid, especially when answering someone else's question.
Jemma's question was a good one, and it's not the first time it's been asked. The answer remains the same, though. If you want to wear non-toric contact lenses even though you have mild astigmatism, the answer is yes you can--if you can get a prescription for them.
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  #216 (permalink)  
Old 07-27-2011, 06:43 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
Posts: 1
Default glasses to contacts conversion--- can someone help pls?

i went to the eye dr today and she gave me my spectacle rx, i also wanted the contact lens rx but it was going to cost me $120. which is crazy because ive worn them before and know how to use them.

and also, i do have astigmatism

will anyone be able to help me how to convert it to contact lens rx? and which one is my actual grade on the rx?

OD (RIGHT): Sph= +1.50 --- Cyl= -2.50 --- Axis= 160

OS (LEFT): Sph= +1.75 --- Cyl= -3.50 --- Axis= 180


ALSO, i used this website called infomedmd.com/infomed/ to help me convert my glasses to contacts but im not sure if it is correct. and im not sure how to read it. WHICH NUMBER DO I USE WHEN ORDERING CONTACTS?

OD (RIGHT): Lens Strength: +1.50-2.75 x 160

OS (LEFT): Lens Strength: +1.75-3.75 x 180


thank you for your help in advance!
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  #217 (permalink)  
Old 07-28-2011, 02:12 PM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 329
Default

Quote:
Originally Posted by kikaylee View Post
i went to the eye dr today and she gave me my spectacle rx, i also wanted the contact lens rx but it was going to cost me $120. which is crazy because ive worn them before and know how to use them.

and also, i do have astigmatism

will anyone be able to help me how to convert it to contact lens rx? and which one is my actual grade on the rx?

OD (RIGHT): Sph= +1.50 --- Cyl= -2.50 --- Axis= 160

OS (LEFT): Sph= +1.75 --- Cyl= -3.50 --- Axis= 180


ALSO, i used this website called infomedmd.com/infomed/ to help me convert my glasses to contacts but im not sure if it is correct. and im not sure how to read it. WHICH NUMBER DO I USE WHEN ORDERING CONTACTS?

OD (RIGHT): Lens Strength: +1.50-2.75 x 160

OS (LEFT): Lens Strength: +1.75-3.75 x 180


thank you for your help in advance!
Wow. This thread started out with Sir Robin explaining how to convert a glasses prescription into one that can be used for contact lenses. What follows is over a hundred people saying "convert my prescription for me." Not the the formula is super simple, bit it's there. The answer to your first question is in post #2.

Second question is about how a prescription is written. I'll help you the best that I can. Let's look at the numbers for your right eye. First is 1.50. That's the sphere, or power of the lenses. Lens.com calls it the "power."
The second number in your OD (right eye) is -2.75, and that's what you put in for "Cylinder" and finally, that 160 is what goes into the "Axis" parameter. (The "x" is just a separator.)

Left eye: +1.75 power, -3.75 cylinder and 180 axis.

Now, once you enter those numbers, then they're going to want a phone number so they can call your eye doctor to confirm that prescription. I hope that's not going to be a problem for you.
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  #218 (permalink)  
Old 07-30-2011, 07:19 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2011
Posts: 1
Default

Hi there,

I was wondering if anyone would be able to help me find out what my contact lens prescription would be based on my prescription for glasses. I got my eye exam done at Walmart Eyecare Centre and the Optician will not help me unless I buy contact lens from them. They are too expensive and I found a deal online so I wanted to order from there.

Heres the prescription:


Rx Sph. Cyl. Axis
OD -2.75 -0.75 20
OS -2.50 -0.75 160

PD =61

Single Vision

*************************************

Any help is appreciated. Thanks so much in advance
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  #219 (permalink)  
Old 08-06-2011, 12:24 PM
Contact Lenses Forum - Senior
 
Join Date: Aug 2010
Posts: 291
Default

Quote:
Originally Posted by sweetumz View Post
Hi there,

I was wondering if anyone would be able to help me find out what my contact lens prescription would be based on my prescription for glasses. I got my eye exam done at Walmart Eyecare Centre and the Optician will not help me unless I buy contact lens from them. They are too expensive and I found a deal online so I wanted to order from there.

Heres the prescription:


Rx Sph. Cyl. Axis
OD -2.75 -0.75 20
OS -2.50 -0.75 160

PD =61

Single Vision

*************************************

Any help is appreciated. Thanks so much in advance
What's the curve of you cornea ? What size do you wear ? How do you know that the size is correct ? How thick are the lenses you want to order ? What material are the lenses made of ? What is the tear layer on your eye like ? Is it compatible with the type of lens you're going to order ? How tightly do your eyelids fit against the eye surface ???
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  #220 (permalink)  
Old 08-20-2011, 06:01 PM
Contact Lenses Forum - Freshman
 
Join Date: Aug 2011
Posts: 1
Default

@Sweetumz -3 contacts for both eyes would be my starting point

@Kikaylee Your prescription is very unusual, it averages out at about nothing for both eyes! Would be interesting to have a retest.

NB In my experience Astigmatism is over judged by some opticians.
For example Ive seen prescriptions such as
+3 -3 axis 70
but when Ive tested them they can see just as well with a straight +1.5
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  #221 (permalink)  
Old 08-21-2011, 08:55 AM
Contact Lenses Forum - Senior
 
Join Date: Jan 2010
Posts: 367
Default

It's illegal, in the US, for an practitioner to refuse to give you a copy of your script or to require you purchase contacts from a particular store. There are very few exceptions. The practitioner is required to give you a copy of your script, even if you don't ask.

That said Walmarts prices for contacts is somewhat competitive. You have no idea what brand of lenses you'll be wearing. You have no idea if Walmarts price is "too expensive".

I'm not sure what you're saying. It's possible your not from the United States. Otherwise you either misunderstood what the practitioner told you or you're making stuff up.

A contact lens exam is more expensive then a spectacle exam. I hope you don't think the internet is a substitute for an eye exam.



Quote:
Originally Posted by sweetumz View Post
Hi there,

I was wondering if anyone would be able to help me find out what my contact lens prescription would be based on my prescription for glasses. I got my eye exam done at Walmart Eyecare Centre and the Optician will not help me unless I buy contact lens from them. They are too expensive and I found a deal online so I wanted to order from there.

Heres the prescription:


Rx Sph. Cyl. Axis
OD -2.75 -0.75 20
OS -2.50 -0.75 160

PD =61

Single Vision

*************************************

Any help is appreciated. Thanks so much in advance
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  #222 (permalink)  
Old 08-26-2011, 01:53 PM
Contact Lenses Forum - Senior
 
Join Date: Nov 2007
Posts: 377
Default

Quote:
Originally Posted by DrJohn View Post
@Sweetumz -3 contacts for both eyes would be my starting point

@Kikaylee Your prescription is very unusual, it averages out at about nothing for both eyes! Would be interesting to have a retest.

NB In my experience Astigmatism is over judged by some opticians.
For example Ive seen prescriptions such as
+3 -3 axis 70
but when Ive tested them they can see just as well with a straight +1.5
Awesome, Dr. John. It's nice to read a post from someone who can say "in my experience." Welcome to the forum, doc.
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  #223 (permalink)  
Old 08-26-2011, 03:49 PM
Contact Lenses Forum - Sophomore
 
Join Date: May 2011
Posts: 66
Default

I see this thread is controversial and understand why, you want a doctors RX but niether here nor there one thing my doctor told me is your contact RX will be slightly less then say your eyeglass RX because the lens sits directly on the eyeball VS glasses which sit several centimeters away from the cornea.
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  #224 (permalink)  
Old 08-26-2011, 04:12 PM
Contact Lenses Forum - Senior
 
Join Date: Dec 2007
Posts: 246
Default Serendipity

Quote:
Originally Posted by fuzzyeyeball View Post
I see this thread is controversial and understand why, you want a doctors RX but niether here nor there one thing my doctor told me is your contact RX will be slightly less then say your eyeglass RX because the lens sits directly on the eyeball VS glasses which sit several centimeters away from the cornea.
Correct, fuzzyeyeball. In rare cases a person may have the same contact lens prescription as their glasses one, but that almost never happens. It's what the smart people call "serendipity."
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  #225 (permalink)  
Old 08-28-2011, 10:22 AM
Contact Lenses Forum - Senior
 
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Default

Quote:
Originally Posted by Enah View Post
Correct, fuzzyeyeball. In rare cases a person may have the same contact lens prescription as their glasses one, but that almost never happens. It's what the smart people call "serendipity."
Incorrect. Just check the formula or an online conversion calculator. A mild script (-3.00) translates to the same script. A stronger script generally suggests a slightly weaker contact lens script.

Serendipity refers to something unexpected. A happy accident.

Forget about a smart person. A person who took the time to read this thread would know the term serendipity doesn't apply. In fact it's the exact opposite of serendipity. It is expected a person with a mild script would have the same contact lens power as spectacle but a person with a stronger script would have a lower contact lens script.

I don't know how rare it is. I don't know how many contact lens wearers have a script of under -3 or -4. I do know it's not serendipitous.
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  #226 (permalink)  
Old 10-03-2011, 12:51 PM
Contact Lenses Forum - Freshman
 
Join Date: Oct 2011
Posts: 2
Question A little help

Today I went to the doctor and she gave me the following prescription for glasses :

OD + 5.5 sph. +1 cyl. 50 axis
OS +6 sph

When it came to contacts she looked at some chart, but the chart didn't have the numbers that matched my glasses, so she wrote the last numbers she had on her chart, saying that this will probably be weaker than what I'm used too, so I should try it out first before ordering a full set.
She gave me these numbers>
OD +6.0 sph. -0.75 cyl 140 axis
OS +6

I would like to know how big the difference is between what she prescribed me and what my eyes would require.
Can anybody help me? I read a lot of post from this forum and others, I looked at converter sites, and that formula too but non gave me my answer.
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  #227 (permalink)  
Old 10-04-2011, 08:09 AM
Contact Lenses Forum - Senior
 
Join Date: Aug 2010
Posts: 291
Default

Quote:
Originally Posted by Andrea303 View Post
Today I went to the doctor and she gave me the following prescription for glasses :

OD + 5.5 sph. +1 cyl. 50 axis
OS +6 sph

When it came to contacts she looked at some chart, but the chart didn't have the numbers that matched my glasses, so she wrote the last numbers she had on her chart, saying that this will probably be weaker than what I'm used too, so I should try it out first before ordering a full set.
She gave me these numbers>
OD +6.0 sph. -0.75 cyl 140 axis
OS +6

I would like to know how big the difference is between what she prescribed me and what my eyes would require.
Can anybody help me? I read a lot of post from this forum and others, I looked at converter sites, and that formula too but non gave me my answer.
No, it will not work
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  #228 (permalink)  
Old 10-04-2011, 10:32 AM
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Join Date: Oct 2011
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Default

Quote:
Originally Posted by Contact Lens Fitter View Post
No, it will not work
Ok, but what would then? I don't get it how she got these numbers, and I can't seem to find a way to calculate them right either.
I really need to change my glasses, so if anybody can help me I would appreciate it.
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  #229 (permalink)  
Old 10-04-2011, 01:29 PM
Contact Lenses Forum - Freshman
 
Join Date: Oct 2011
Posts: 1
Default Convert glasses prescription to contact prescription

Would anyone mind helping me with this? I'd heard that if your prescription is over -4.00 you just subtract -.25 from the original, but I'm unsure.

Sphere Cylinder Axis
Right -6.25 -2.25 180
Left -6.25 -1.25 176
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  #230 (permalink)  
Old 10-05-2011, 08:01 AM
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Join Date: Jan 2010
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Default

Quote:
Originally Posted by Andrea303 View Post
Ok, but what would then? I don't get it how she got these numbers, and I can't seem to find a way to calculate them right either.
I really need to change my glasses, so if anybody can help me I would appreciate it.
Contact lens fitter said the numbers won't work. I'm making an exception to my policy and posting the results of a a calculator.

The calculator suggests +7.0 -1.0 140 and your +6 should be +6.50

I don't agree with contact lens fitter. The numbers your eye doctor gave you might work even though math suggests a different contact lens script. The only way to know is to be examined with trial lenses.

Your doctor told the contact lens script he was suggesting was weaker then your eye glass script and you should wear trial lenses. Makes sense to me.

Maybe the calculator, and contact lens fitter, are right and you need a stronger script. Maybe the eye doctor who examined you is right and you'll do better with a weaker script.

You need trial lenses. Your doctor said you need trial lenses. Why not just let your doctor order the trial lenses?

A lot of the popular toric lenses aren't available in a script greater then +6.0 You'll either have to make do with a slightly lower script or limit your choice of brands. Copper Vision has several lenses which should work for you. J&J (Accuvue) maybe not.
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  #231 (permalink)  
Old 10-05-2011, 09:32 AM
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+7.00 and +6.50 is where I would 'start'. You won't find a definitive answer in numbers. We are not digital creatures. This why my office is filled with hundreds of 'trial lenses'. The number you need, is the number you see best with. That's why your Dr asks YOU, is this better or is this better. The Dr doesn't know, only you do when looking through the lenses.That's why I use trial lenses EVERY TIME a patient has a Rx change. We don't know how a patient will see until they put the lenses on.
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  #232 (permalink)  
Old 10-05-2011, 09:40 AM
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Quote:
Originally Posted by Contact Lens Fitter View Post
+7.00 and +6.50 is where I would 'start'. You won't find a definitive answer in numbers. We are not digital creatures. This why my office is filled with hundreds of 'trial lenses'.
That's a very good point, Contact Lens Fitter.

Wow, look at this thread! We can almost start a whole new forum with all this information.
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  #233 (permalink)  
Old 10-05-2011, 10:03 AM
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Quote:
Originally Posted by Contact Lens Fitter View Post
+7.00 and +6.50 is where I would 'start'. You won't find a definitive answer in numbers. We are not digital creatures. This why my office is filled with hundreds of 'trial lenses'. The number you need, is the number you see best with. That's why your Dr asks YOU, is this better or is this better. The Dr doesn't know, only you do when looking through the lenses.That's why I use trial lenses EVERY TIME a patient has a Rx change. We don't know how a patient will see until they put the lenses on.
That's what the calculator suggests but there are relatively few toric lenses available with a power greater then +6.0. Starting with a script where the trial lens is readily available may make some sense. People with scripts that aren't in the mainstream may have to decide if vision which is "good enough" is OK or if they need to buy lenses which are more expensive, might not be as comfortable and might need careful cleaning (quarter vs daily disposable).

The poster needs to make sure doesn't just prescribe J&J lenses. I'd hate to think the eye doctor isn't taking the time to find the lens mfg which offers the script the poster needs. Coppervision might work
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  #234 (permalink)  
Old 10-05-2011, 07:41 PM
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I would try regular spheres first, if the astigmatism all on the cornea. The other problem is size. You have to make sure they're the right size. One size DOES NOT fit all.
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  #235 (permalink)  
Old 10-18-2011, 08:04 AM
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Can someone tell me what my contact lens prescription would be ? thanks.
Sphere Cylinder Axis
OD Right Eye -6.00 -1.25 1.75
OS Left Eye -6.25 -1.00 1.50
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  #236 (permalink)  
Old 10-18-2011, 08:26 AM
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Quote:
Originally Posted by traveller100 View Post
Can someone tell me what my contact lens prescription would be ? thanks.
Sphere Cylinder Axis
OD Right Eye -6.00 -1.25 1.75
OS Left Eye -6.25 -1.00 1.50
What lens and what size of lens are you wearing, and what brand and model ??? It all has an effect on the CL Rx. Have you been properly fit already or are you trying the 'one size fits all', which it doesn't.
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  #237 (permalink)  
Old 10-18-2011, 08:51 AM
Contact Lenses Forum - Bachelors Degree
 
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Quote:
Originally Posted by Contact Lens Fitter View Post
What lens and what size of lens are you wearing, and what brand and model ??? It all has an effect on the CL Rx. Have you been properly fit already or are you trying the 'one size fits all', which it doesn't.
It looks like traveller100--along with about a hundred other people--is trying to use their glasses prescription to determine their contact lens prescription, so they want to be told what their lens size and brand would be.
I don't understand why all these people are trying to do that here. If they're going to order contact lenses, they'll need a prescription from their doctor anyway.
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  #238 (permalink)  
Old 10-18-2011, 09:35 AM
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Quote:
Originally Posted by Contact Lens Fitter View Post
What lens and what size of lens are you wearing, and what brand and model ??? It all has an effect on the CL Rx. Have you been properly fit already or are you trying the 'one size fits all', which it doesn't.
size 86 ,AV OASYS for astigmatism, thanks

OD Right Eye -6.00 -1.25 1.75
OS Left Eye -6.25 -1.00 1.50
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  #239 (permalink)  
Old 10-18-2011, 06:31 PM
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Quote:
Originally Posted by traveller100 View Post
size 86 ,AV OASYS for astigmatism, thanks

OD Right Eye -6.00 -1.25 1.75
OS Left Eye -6.25 -1.00 1.50
Nine times out of ten, the best results would be
OD -5.75-0.75x180
OS -6.00-0.75x150
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  #240 (permalink)  
Old 10-30-2011, 01:34 AM
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Default Need help.

i wanna know what my contact lens prescription is. thank you.

eye prescription:

Right:
sphere: -0.50
cyl: -0.50
axis: 180
total inset & decentration: 61m

Left:
sphere: -1.00
cyl: blank
axis: blank
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  #241 (permalink)  
Old 11-24-2011, 08:54 PM
Contact Lenses Forum - Freshman
 
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Default Need help

Hi,

This is my first post here and i was wondering if you guys can help.

I have my glasses prescription but have absoultly no idea how to get the POW needed to order my contacts. I'm guessing you need only one number/POW for each eye, and i have this bunch of numbers. I tried 'googleing' and didn't help much either except figuring out what all the abbreviations mean....

that is until I saw this post and it looked like alot of help, but... too bad my understanding of all this is not too good. SO i was wondering if somebody could help. So, this is pretty much what my pres' says:
.................................................. ....
SPH CYL Axis

OD -1.50. -0.50 116

OS -1.25 -0.75 053


.................................................. .....


so, could somebody (more experienced than i am ) find the POW of my current lenses and a recommendation for my contact strength

thank you.
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  #242 (permalink)  
Old 11-24-2011, 09:54 PM
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Quote:
Originally Posted by Dharm View Post
Hi,

This is my first post here and i was wondering if you guys can help.

I have my glasses prescription but have absoultly no idea how to get the POW needed to order my contacts. I'm guessing you need only one number/POW for each eye, and i have this bunch of numbers. I tried 'googleing' and didn't help much either except figuring out what all the abbreviations mean....

that is until I saw this post and it looked like alot of help, but... too bad my understanding of all this is not too good. SO i was wondering if somebody could help. So, this is pretty much what my pres' says:
.................................................. ....
SPH CYL Axis

OD -1.50. -0.50 116

OS -1.25 -0.75 053


.................................................. .....


so, could somebody (more experienced than i am ) find the POW of my current lenses and a recommendation for my contact strength

thank you.
Unless you're addressed at Doctor, I suggest you see someone who is.
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  #243 (permalink)  
Old 11-25-2011, 06:14 AM
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Default

I would like to know what my contact prescription would be please
I do believe I am long sighted aswell...

right eye:
Sph: +6.75
Cyl: -1.00
Axis: 15.0

Left Eye:
Sph: +7.50
Cyl: -1.00
Axis: 10.0

Cheers
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  #244 (permalink)  
Old 11-25-2011, 10:33 AM
Contact Lenses Forum - Senior
 
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Default

Quote:
Originally Posted by Dharm View Post
Hi,

This is my first post here and i was wondering if you guys can help.

I have my glasses prescription but have absoultly no idea how to get the POW needed to order my contacts. I'm guessing you need only one number/POW for each eye, and i have this bunch of numbers. I tried 'googleing' and didn't help much either except figuring out what all the abbreviations mean....

that is until I saw this post and it looked like alot of help, but... too bad my understanding of all this is not too good. SO i was wondering if somebody could help. So, this is pretty much what my pres' says:
.................................................. ....
SPH CYL Axis

OD -1.50. -0.50 116

OS -1.25 -0.75 053


.................................................. .....


so, could somebody (more experienced than i am ) find the POW of my current lenses and a recommendation for my contact strength

thank you.
What you need is a 'fitting' from a professional. Once you have been fit properly and know for certain what fits, THEN order on-line. Also have your lenses checked by a professional every six months.
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  #245 (permalink)  
Old 11-25-2011, 09:46 PM
Contact Lenses Forum - Junior
 
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Default

Quote:
Originally Posted by Dharm View Post
Hi,

This is my first post here and i was wondering if you guys can help.

I have my glasses prescription but have absoultly no idea how to get the POW needed to order my contacts. I'm guessing you need only one number/POW for each eye, and i have this bunch of numbers. I tried 'googleing' and didn't help much either except figuring out what all the abbreviations mean....

that is until I saw this post and it looked like alot of help, but... too bad my understanding of all this is not too good. SO i was wondering if somebody could help. So, this is pretty much what my pres' says:
.................................................. ....
SPH CYL Axis

OD -1.50. -0.50 116

OS -1.25 -0.75 053


.................................................. .....


so, could somebody (more experienced than i am ) find the POW of my current lenses and a recommendation for my contact strength

thank you.
actually you need another set of numbers for contact lenses.
your sph pertains to myopia with its negative values
cyl pertains to astigmatism
axis if i remember this correctly would have something to do with which lines you see more clearly so perhaps focus or rotation

for contacts you need to get your base curve too
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  #246 (permalink)  
Old 11-26-2011, 09:30 AM
Contact Lenses Forum - Ph.D.
 
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Wink

Quote:
Originally Posted by Malcolmduggan View Post
Can someone tell me what my contact lens prescription would be based on my following glasses one? (mainly for reading)

Sphere Cylinder Axis
Right -0.50 -025 125.0
Left -1.25 -025 175.0

Distance acuity Near Acuity
Right 6/6 n6
Left 6/9-2 n6
eye glass prescriptions cannot be used to convert to a contact lens prescription without a few elements.
1) A keratometer reading to determine the curvature of your cornea
2) A peak with a slit lamp to check eye tissue
3) field test and corneal diameter measure ment
4) tear film stability

unless youve gone thru these check ups I do not recommend just coverting an eye glass prescription. There is vertex distance with an eye glass prescription and Powers need to be adjusted accordingly whether your fitted with soft or rgp lenses.
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  #247 (permalink)  
Old 11-26-2011, 11:41 AM
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Default

Regardless of numbers, the ONLY way to tell if a CL fits (and won't damage your eyes) is to have a professional see it on the eye with a slit-lamp.
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  #248 (permalink)  
Old 11-26-2011, 03:55 PM
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Quote:
Originally Posted by Contact Lens Fitter View Post
Regardless of numbers, the ONLY way to tell if a CL fits (and won't damage your eyes) is to have a professional see it on the eye with a slit-lamp.
agreed! frankly i personally would never gamble with my eyes!
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  #249 (permalink)  
Old 12-12-2011, 11:01 AM
Contact Lenses Forum - Freshman
 
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Posts: 3
Question Rx Help

ok so i had tried the one link that was posted and it gave me the one for the left eye and so now i am only needing the right eye information.

My Right Eye Prescription is -275 -425 x 011

My Left Eye is -300 -275 x 173 and was converted to -3.00 -2.25 x 170

Can anyone help me?

Oh i am far sighted in one eye and near sighted in the other with Astigmatism in both eyes...
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  #250 (permalink)  
Old 12-12-2011, 11:28 AM
Contact Lenses Forum - Ph.D.
 
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Quote:
Originally Posted by brittany View Post
ok so i had tried the one link that was posted and it gave me the one for the left eye and so now i am only needing the right eye information.

My Right Eye Prescription is -275 -425 x 011

My Left Eye is -300 -275 x 173 and was converted to -3.00 -2.25 x 170

Can anyone help me?

Oh i am far sighted in one eye and near sighted in the other with Astigmatism in both eyes...
first off im an ecp and your prescription does NOT make any sense. Dont you think u should get a proper contact lens fit by seeing your eye doc....!?!?!?!?!?!
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  #251 (permalink)  
Old 12-12-2011, 12:06 PM
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Quote:
Originally Posted by luvbostonxo2's View Post
first off im an ecp and your prescription does NOT make any sense. Dont you think u should get a proper contact lens fit by seeing your eye doc....!?!?!?!?!?!
I have done that i just went on Saturday... this is what they gave me...?!?!?!
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  #252 (permalink)  
Old 12-12-2011, 01:41 PM
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Quote:
Originally Posted by brittany View Post
I have done that i just went on Saturday... this is what they gave me...?!?!?!
ANYways does not make sense to me.....why did they not account for the vertex distance and change your toric axis and power....?

Just curious are u seeing clearly!?
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  #253 (permalink)  
Old 12-12-2011, 05:20 PM
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Quote:
Originally Posted by brittany View Post
I have done that i just went on Saturday... this is what they gave me...?!?!?!
You went for an eye exam and were given a Rx for eyeglasses. This is not the same as a contact lens fitting. In a fitting, the fitter would have taken corneal curvature measurements, put a contact lens on your eye and observed it to make sure the size was right and the vision was good. If the Drs office did not do this, then you were not fit for CLs. And BTW, you are nearsighted in both eyes (with astigmatism ) if the numbers you have hear are correct.
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  #254 (permalink)  
Old 12-13-2011, 10:22 AM
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Quote:
Originally Posted by Contact Lens Fitter View Post
You went for an eye exam and were given a Rx for eyeglasses. This is not the same as a contact lens fitting. In a fitting, the fitter would have taken corneal curvature measurements, put a contact lens on your eye and observed it to make sure the size was right and the vision was good. If the Drs office did not do this, then you were not fit for CLs. And BTW, you are nearsighted in both eyes (with astigmatism ) if the numbers you have hear are correct.
Yeah they did not do any of this but obviously i need to look at going to a different center...
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  #255 (permalink)  
Old 12-14-2011, 09:57 PM
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ok this has been an ongoing question for a long time now. i went ahead and ask my opthalmologist. she and the optometrists (several opto) provided me with the formula

D = F / 1-d(F)

D is your contacts prescription
F is your eyeglass prescription
d = 0.012

astigmatism grade has a different chart but they just basically add it on. anything lower than 4.0 does not really need to be changed

hyperopia = higher contacts prescription
myopia = lower contacts prescription

i was given an example of let's say -7.00 sph -3.75 cyl
i will most likely be given a contacts prescription of about -6.25 sph -3.00 cyl

remember the result of the computation above is just a BASE LINE. it all depends upon what the patient can tolerate. generally it is their standard practice not to give the maximum grade. but rather use what is a good enough vision for you to work with.
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  #256 (permalink)  
Old 12-15-2011, 10:29 AM
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Quote:
Originally Posted by cc(,``o View Post
ok this has been an ongoing question for a long time now. i went ahead and ask my opthalmologist. she and the optometrists (several opto) provided me with the formula

D = F / 1-d(F)

D is your contacts prescription
F is your eyeglass prescription
d = 0.012

astigmatism grade has a different chart but they just basically add it on. anything lower than 4.0 does not really need to be changed

hyperopia = higher contacts prescription
myopia = lower contacts prescription

i was given an example of let's say -7.00 sph -3.75 cyl
i will most likely be given a contacts prescription of about -6.25 sph -3.00 cyl

remember the result of the computation above is just a BASE LINE. it all depends upon what the patient can tolerate. generally it is their standard practice not to give the maximum grade. but rather use what is a good enough vision for you to work with.
That's cool, cc(,``o. Thanks. Just one thing though. I probably would have said

hyperopia = plus sign (or no sign) before the number
myopia = minus sign before the number

There's nothing wrong with the way you described it, it's just that I'd be wondering "how high is higher?" The prescription in your example has minus signs so it's a myopic prescription.
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  #257 (permalink)  
Old 01-22-2012, 09:41 AM
vij vij is offline
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My spectacle power

L -7.5 with cyl -4.5
R -6.0 withy cyl -4.5

First tried torics with prescription -
L -7.0 with cyl -2.75
R -5.5 with cyl -2.75

Right eye was perfect. Left eye had overcorrection.

Then reduced left to
L -6.0 with cyl -2.75

Thats what I am using now.
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  #258 (permalink)  
Old 01-24-2012, 03:27 PM
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Quote:
Originally Posted by vij View Post
My spectacle power

L -7.5 with cyl -4.5
R -6.0 withy cyl -4.5

First tried torics with prescription -
L -7.0 with cyl -2.75
R -5.5 with cyl -2.75

Right eye was perfect. Left eye had overcorrection.

Then reduced left to
L -6.0 with cyl -2.75

Thats what I am using now.
That's some fairly severe myopia, vijy. Can you give us an idea of how blurry your vision is without contacts or glasses?
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  #259 (permalink)  
Old 01-24-2012, 10:29 PM
vij vij is offline
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Quote:
Originally Posted by CousinMuscles View Post
That's some fairly severe myopia, vijy. Can you give us an idea of how blurry your vision is without contacts or glasses?
Mornings its ok. Evening it feels pretty bad. The normal font letters are blurred with the left eye even at 1.5 feet. With the right I can atleast read comfortably at that distance. I think its the astigmatism that makes everything so much more worse. In the daylight seeing objects without contacts is ofcourse blurry but manageable - I have even driven without glasses. Ofcourse no chance in hell at night.


I am considering Lasik on the left eye to start with. All I ask and pray for is for the myopia to come down below 3. That way my expectations are not high. But the smallish clinic near my home refused to even consider me for Lasik even without even testing my eyes because of my astigmatism. I wrote to the biggest eye hospital in India and they say they can consider and have asked me to do some tests.
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  #260 (permalink)  
Old 01-25-2012, 04:43 AM
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Quote:
Originally Posted by vij View Post
Mornings its ok. Evening it feels pretty bad. The normal font letters are blurred with the left eye even at 1.5 feet. With the right I can atleast read comfortably at that distance. I think its the astigmatism that makes everything so much more worse. In the daylight seeing objects without contacts is ofcourse blurry but manageable - I have even driven without glasses. Ofcourse no chance in hell at night.


I am considering Lasik on the left eye to start with. All I ask and pray for is for the myopia to come down below 3. That way my expectations are not high. But the smallish clinic near my home refused to even consider me for Lasik even without even testing my eyes because of my astigmatism. I wrote to the biggest eye hospital in India and they say they can consider and have asked me to do some tests.
better go to a bigger clinic. all i can say is that i had a surgery myself and my eyeglass prescription was
-5.5 sph -3.75 cyl
-6.0 sph -3.75 cyl

by the way that is eyeglass prescription which is different from what the machine read. machine read my grade was over -5.00 for astigmatism. and then the excimer machine can only correct upto -3 or was it -4 at a time.

i had the surgery last nov. need a 2nd surgery though because i have residual grade which is NORMAL and EXPECTED for astigmatism.

i currently have a residual grade of -1.50 sph and -1.50 cyl from machine reading
i only put in my right eye prescription here because my left eye reading is not accurate as i have corneal scarring. the reading is off the charts depending where the machine reads my grade
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  #261 (permalink)  
Old 01-25-2012, 06:06 AM
vij vij is offline
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Quote:
Originally Posted by cc(,``o View Post
better go to a bigger clinic. all i can say is that i had a surgery myself and my eyeglass prescription was
-5.5 sph -3.75 cyl
-6.0 sph -3.75 cyl

by the way that is eyeglass prescription which is different from what the machine read. machine read my grade was over -5.00 for astigmatism. and then the excimer machine can only correct upto -3 or was it -4 at a time.

i had the surgery last nov. need a 2nd surgery though because i have residual grade which is NORMAL and EXPECTED for astigmatism.

i currently have a residual grade of -1.50 sph and -1.50 cyl from machine reading
i only put in my right eye prescription here because my left eye reading is not accurate as i have corneal scarring. the reading is off the charts depending where the machine reads my grade
Good man. You have reached a stage where your eye prescription isnt embarrassing. -1.5 is pretty manageable. Do you really want to go for the procedure again?

And yes - I am going to get some tests done soon. I will be over the moon if I was left with residual -1.5 myopia.

I am also considered pre-diabetic or early stage diabetic since 6 months. So there's that. I dont need to take medicines yet and managing my blood-sugar easily with exercise.

A question for you. Is this corneal scarring in your other eye posing real hindrance in vision. What are the symptoms ?
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  #262 (permalink)  
Old 01-25-2012, 06:52 AM
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Quote:
Originally Posted by vij View Post
Good man. You have reached a stage where your eye prescription isnt embarrassing. -1.5 is pretty manageable. Do you really want to go for the procedure again?

And yes - I am going to get some tests done soon. I will be over the moon if I was left with residual -1.5 myopia.

I am also considered pre-diabetic or early stage diabetic since 6 months. So there's that. I dont need to take medicines yet and managing my blood-sugar easily with exercise.

A question for you. Is this corneal scarring in your other eye posing real hindrance in vision. What are the symptoms ?
it's not embarrassing but it's still pretty bad because i will still need eyeglasses to drive. the -1.5 doesn't sound too bad but paired with astigmatism it is fairly bad. also to achieve the best VA for me i needed a -3.50 sph -1.00 cyl prescription for eyeglasses. my opthalmologist suggested i don't let my eyes get used to the overcorrection. so, in order for me to drive without glasses and see better, i need the surgery. it's fairly a painful procedure since I had PRK done but yea i want a better vision where i don't need eyeglasses at all. i don't need to pay more anyway but will have to spend for medicines though.
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  #263 (permalink)  
Old 01-25-2012, 10:41 AM
Contact Lenses Forum - Bachelors Degree
 
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Default A Very Long Thread

Wow, this thread is still going after over 200 posts. To be honest I think a few of the posts here should have started new threads.
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  #264 (permalink)  
Old 02-06-2012, 03:03 PM
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Quote:
Originally Posted by Contact Lens Fitter View Post
Adding half the cylinder to the sphere only works in some cases and depends on the thickness and stiffness of the specific lens being used. Power gain due to thickness is an increase in the strength of the Rx along the cylinders axis due to the extra thickness. As a rule, the cylinder increase is aprox. 30%. I have seen patients with a cyl of -4.00 be corrected to 20/20 with a -2.75 cyl correction. When it comes to correcting astigmatism, less is more. Don't forget, if the Rx is -6.50-3.00x180, the power along 180 is -6.50 but the power along 90 is NOT -3.00, it's -9.50 !!! Add to that the 'power gain' and we find out why some people say torics don't give them a good correction. Many people are over-corrected.

Hello Contact Lens Fitter, thanks for your info here. It's very much appreciated.

Knotlob was saying above that "it sounds like it is only an approximation (as I had always believed) and the actual correct/optimum prescription must be found by actual trial and error by the contact lens fitter."

Is this the case that combining the sphere and the cylinder correction values need to be done with trial and error while fitting the patient or can it be mathematically calculated precisely?

For example, my ecp recently gave me a prescription that I find is about -0.25 diopters too strong on one eye as I have compared with my previous script and I prefer that one much better. Both the spectacle scripts did not change between ecp visits (half a year time frame). But different ecp's had different opinions on what my contact lens script should be.
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  #265 (permalink)  
Old 02-06-2012, 07:43 PM
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Things are much less numerical or mathematical as one would expect. I have seen people get 20/20 vision when their Cyl was -3.50 in each eye and I gave them A -2.25 to try. I certainly did not expect it. I thought 20/30 at best. HOWEVER, vision is; how the brain interprets the picture it is given. This is not something that can be determined digitally or numerically. It would not be unusual to have three slightly different Rxs if you were tested on a Mon, Weds, and Fri of the same week.
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  #266 (permalink)  
Old 02-09-2012, 10:35 AM
Contact Lenses Forum - Freshman
 
Join Date: Feb 2012
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Smile Please help me

My prescription for eye glasses:

SPHERE CYLINDER AXIS

OD -2.00 -3.00 180
OS -3.00 -3.25 180

can anyone figure this out?
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  #267 (permalink)  
Old 02-22-2012, 06:29 PM
Contact Lenses Forum - Freshman
 
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Default Can someone help me??

I found the formula to be a really helpful idea, but I'm having a bit of trouble really figuring it out. Reading some of the other posts, my prescription looks a little strange. Can someone help me figure this out?


SPHERE CYLINDER AXIS
R -425 -075 015
L -375 -050 148


And the box for astigmatism is also checked, which I didn't know about before this visit.
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  #268 (permalink)  
Old 03-12-2012, 10:59 AM
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Default

I'm hoping someone can help me with my eyeglass conversion. I have an astigmatism - my daughter's island wedding is just around the corner, and my daughter suddenly realized that I won't be able to participate in the scuba expedition she plans for me with my glasses (here's hoping I survive THAT, lol ). So she is trying to get me some contacts at the last minute.

Since she (and her terrific fiance) are paying my way, I don't want to add an optometrist visit on top of everything else, if I can avoid it. I read through the thread (terrific info!!). Since I have math-phobia (I almost broke out into a cold sweat just reading some of the instructions), I went to the CIBAVision link given here. After a few tries, I figured out how to make it work (I was putting "mm" in the Vertex Distance box - when I just put in 12 as suggested, it worked).

I'm used to working on a Mac - which is temporarily sort of broken - and I don't know how to make a pdf copy of the screen on this PC, so here is is my eyeglass prescription:

OD:+2.25| CYL:-.50| AXIS:070| ADD:+2.25

OS:+2.75| CYL:-.50| AXIS:100| ADD:+2.25

This is what CIBA gave me:

Right Eye
AIR OPTIX for ASTIGMATISM
+2.25 -0.75 x 70

AIR OPTIX for ASTIGMATISM (ANZ)
+2.25 -0.75 x 70

DAILIES Toric
+2.25 -0.75 x 80

Left Eye
AIR OPTIX for ASTIGMATISM
+2.75 -0.75 x 100

AIR OPTIX for ASTIGMATISM (ANZ)
+2.75 -0.75 x 100

DAILIES Toric
+2.75 -0.75 x 100

Now - these brands are REALLY expensive (especially since I basically only need them for a week!), so my daughter is trying to get Soflense Disposables for Astigmatism for me. But for this, the "axis" it doesn't give "70" as an option - the only options are 20, 90, 160, and 180.

Can anyone help me with this? Is this brand impossible for me?

Thanks so much!
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  #269 (permalink)  
Old 03-13-2012, 07:53 AM
Contact Lenses Forum - Senior
 
Join Date: Jan 2010
Posts: 367
Default

JMO but you're looking at this backwards. First contact the scuba expedition people. See if you can get a mask that works with your glasses.

You want to pay for the lenses but not pay for an eye exam. An eye doctor (US) will give you trial lenses as part of the eye exam. Pay for an eye exam and you'll get more then enough lenses to satisfy your needs. You just want to wear the lenses when you dive? You might be able to get adequate vision without using toric lenses. Toric air optix lenses will cost you almost $50/ box and you'll probably need 2 boxes. You should be able to get a contact lens eye exam, including trial lenses for less then that.





Quote:
Originally Posted by sitstaygimmeeakiss View Post
I'm hoping someone can help me with my eyeglass conversion. I have an astigmatism - my daughter's island wedding is just around the corner, and my daughter suddenly realized that I won't be able to participate in the scuba expedition she plans for me with my glasses (here's hoping I survive THAT, lol ). So she is trying to get me some contacts at the last minute.
..........

Now - these brands are REALLY expensive (especially since I basically only need them for a week!), so my daughter is trying to get Soflense Disposables for Astigmatism for me. But for this, the "axis" it doesn't give "70" as an option - the only options are 20, 90, 160, and 180.

Can anyone help me with this? Is this brand impossible for me?

Thanks so much!
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  #270 (permalink)  
Old 03-13-2012, 08:15 AM
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Join Date: Mar 2012
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Default

Quote:
Originally Posted by lurker2010 View Post
JMO but you're looking at this backwards. First contact the scuba expedition people. See if you can get a mask that works with your glasses.

You want to pay for the lenses but not pay for an eye exam. An eye doctor (US) will give you trial lenses as part of the eye exam. Pay for an eye exam and you'll get more then enough lenses to satisfy your needs. You just want to wear the lenses when you dive? You might be able to get adequate vision without using toric lenses. Toric air optix lenses will cost you almost $50/ box and you'll probably need 2 boxes. You should be able to get a contact lens eye exam, including trial lenses for less then that.
Oh, thank you! I did NOT know any of this!! I did wear contacts before, but it was so long ago I've forgotten.

I think she already did contact the scuba people. She's so excited that I'm going to do this - it's WAY outside the realm of what I'd usually do (and I'm so excited, too). And I know nothing (as you probably realize) about toric or any other lenses... I'll let her know about this.

Thanks again!
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  #271 (permalink)  
Old 03-13-2012, 09:58 AM
Contact Lenses Forum - Senior
 
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Default

Quote:
Originally Posted by sitstaygimmeeakiss View Post
Oh, thank you! I did NOT know any of this!! I did wear contacts before, but it was so long ago I've forgotten.

I think she already did contact the scuba people. She's so excited that I'm going to do this - it's WAY outside the realm of what I'd usually do (and I'm so excited, too). And I know nothing (as you probably realize) about toric or any other lenses... I'll let her know about this.

Thanks again!
The contacts are for you? You need to see your eye doctor. I guess you could see your daughters doctor.
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  #272 (permalink)  
Old 03-13-2012, 10:45 AM
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Default

Quote:
Originally Posted by lurker2010 View Post
The contacts are for you? You need to see your eye doctor. I guess you could see your daughters doctor.
Well, I could see any doctor, actually... daughter doesn't live in the area anyway - but that's not relevant. We had planned to order some online by converting my eyeglass prescription (recently had the exam) - but this will resolve the problem.
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  #273 (permalink)  
Old 03-13-2012, 03:13 PM
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Default

Quote:
Originally Posted by sitstaygimmeeakiss View Post
Well, I could see any doctor, actually... daughter doesn't live in the area anyway - but that's not relevant. We had planned to order some online by converting my eyeglass prescription (recently had the exam) - but this will resolve the problem.
A recent exam...Your doctor may just let you pay the difference between a regular exam and a contact lens exam. I'd tell the doctor you want contacts for your daughters wedding and are considering continuing to wear them. Not only do toric lenses cost more but many doctors charge more if they prescribe toric lenses.
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  #274 (permalink)  
Old 03-13-2012, 03:29 PM
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Join Date: Mar 2012
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Default

Quote:
Originally Posted by lurker2010 View Post
A recent exam...Your doctor may just let you pay the difference between a regular exam and a contact lens exam. I'd tell the doctor you want contacts for your daughters wedding and are considering continuing to wear them. Not only do toric lenses cost more but many doctors charge more if they prescribe toric lenses.
Nope. Already called & they just quoted me the regular price, also telling me my insurance won't pay for it until next year. I'm going to call around tomorrow, though.
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  #275 (permalink)  
Old 03-15-2012, 03:04 AM
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Default

my contact lens prescription is diferent from my glasses
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  #276 (permalink)  
Old 03-15-2012, 08:07 AM
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Default

Quote:
Originally Posted by zooeyblu View Post
my contact lens prescription is diferent from my glasses
Obviously - that's the point of this whole thread...
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  #277 (permalink)  
Old 03-15-2012, 08:49 AM
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Join Date: Jan 2010
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Default

Quote:
Originally Posted by sitstaygimmeeakiss View Post
Obviously - that's the point of this whole thread...
What is the point of this thread? Patients in the US are required to get a script in order to purchase contacts. The script has to specify not only the parameters of the lens but the actual brand. You should run from an ECP who need the patients help in converting a spectacle script to a contact lens script.

A few of the poster may be from a country where a script isn't required. Some of us with high scripts want to know if a particular lens might be work for us.

ECP use trial lenses in fitting. Buy even a couple of brands or alternate parameters and your ECP fess will be less then the money wasted on the wrong lenses.

You haven't the slightest idea if you can get adequate vision, for your purposes, without paying $$$ for toric lenses. If you do you have no idea how close the axis has to be to your converted script in order to give you proper vision. Trial lenses, and an exam, is the way to find out.
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  #278 (permalink)  
Old 03-15-2012, 10:04 AM
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Join Date: Mar 2012
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Default

Quote:
Originally Posted by lurker2010 View Post
What is the point of this thread? Patients in the US are required to get a script in order to purchase contacts. The script has to specify not only the parameters of the lens but the actual brand. You should run from an ECP who need the patients help in converting a spectacle script to a contact lens script.

A few of the poster may be from a country where a script isn't required. Some of us with high scripts want to know if a particular lens might be work for us.

ECP use trial lenses in fitting. Buy even a couple of brands or alternate parameters and your ECP fess will be less then the money wasted on the wrong lenses.

You haven't the slightest idea if you can get adequate vision, for your purposes, without paying $$$ for toric lenses. If you do you have no idea how close the axis has to be to your converted script in order to give you proper vision. Trial lenses, and an exam, is the way to find out.

Good Lord - give me a break. I thanked the first poster and SAID I'm going to an optometrist. Still, I don't know how "A few of the poster may be from a country where a script isn't required." makes this any different for me than it would be for them... just the same, I got the info I needed and now - I'm out of here.

Thank you & goodbye!
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  #279 (permalink)  
Old 05-25-2012, 11:38 AM
Contact Lenses Forum - Freshman
 
Join Date: May 2012
Posts: 3
Default Converting glasses to contact lens

Hello, my glasses prescription is:
RE +4.50
LE +6.50/0.75/110
could someone help me on RGP prescription?
Boston EO prescription is the same as menicon Z (or menicon z alpha)?
Thank you, Nando
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  #280 (permalink)  
Old 05-25-2012, 01:10 PM
Contact Lenses Forum - Ph.D.
 
Join Date: Nov 2011
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Default

Quote:
Originally Posted by nando View Post
Hello, my glasses prescription is:
RE +4.50
LE +6.50/0.75/110
could someone help me on RGP prescription?
Boston EO prescription is the same as menicon Z (or menicon z alpha)?
Thank you, Nando
wowowow your willing to just willy nilly get a rgp fitting online without having an eye doc measuring your cornea..!?

why don't you see an ecp and get fitted properly. RGP lenses that dont fit right or actually any contact lens that doesn't fit right will harm your eyes.

also you are looking at two different materials which have completely different features.
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  #281 (permalink)  
Old 05-25-2012, 08:46 PM
Contact Lenses Forum - Senior
 
Join Date: Jan 2010
Posts: 367
Default

Quote:
Originally Posted by luvbostonxo2's View Post
wowowow your willing to just willy nilly get a rgp fitting online without having an eye doc measuring your cornea..!?

why don't you see an ecp and get fitted properly. RGP lenses that dont fit right or actually any contact lens that doesn't fit right will harm your eyes.

also you are looking at two different materials which have completely different features.
+1 RGP lenses, actually almost any lens, ordered by your ECP can be returned for credit if adjustments to your script are needed. I'm talking about lenses which need to be specially ordered for your script. ECP can give you as many trial lenses ("regular contacts") as is appropriate.
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  #282 (permalink)  
Old 05-26-2012, 03:04 PM
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Join Date: May 2012
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Default

Quote:
Originally Posted by lurker2010 View Post
+1 RGP lenses, actually almost any lens, ordered by your ECP can be returned for credit if adjustments to your script are needed. I'm talking about lenses which need to be specially ordered for your script. ECP can give you as many trial lenses ("regular contacts") as is appropriate.
Actually my prescription for Boston EO is:
RE 4,50 diam. 9.30 RC 8.10
LE 7,00 diam. 9.30 RC 8.25
Just wondering if i could transpose this prescription to Menicon Z
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  #283 (permalink)  
Old 05-26-2012, 03:07 PM
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Default

Quote:
Originally Posted by luvbostonxo2's View Post
wowowow your willing to just willy nilly get a rgp fitting online without having an eye doc measuring your cornea..!?

why don't you see an ecp and get fitted properly. RGP lenses that dont fit right or actually any contact lens that doesn't fit right will harm your eyes.

also you are looking at two different materials which have completely different features.
Actually my prescription for Boston EO is:
RE 4,50 diam. 9.30 RC 8.10
LE 7,00 diam. 9.30 RC 8.25
Just wondering if i could transpose this prescription to Menicon Z
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  #284 (permalink)  
Old 05-26-2012, 03:19 PM
Contact Lenses Forum - Ph.D.
 
Join Date: Nov 2011
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Default

Quote:
Originally Posted by nando View Post
Actually my prescription for Boston EO is:
RE 4,50 diam. 9.30 RC 8.10
LE 7,00 diam. 9.30 RC 8.25
Just wondering if i could transpose this prescription to Menicon Z
yes no prob...just beware tho that Menicon Z lens is an ultra high DK lens much higher than Boston EO so you may get much more lipid and protein deposits.
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  #285 (permalink)  
Old 05-26-2012, 03:20 PM
Contact Lenses Forum - Ph.D.
 
Join Date: Nov 2011
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Default

Quote:
Originally Posted by nando View Post
Actually my prescription for Boston EO is:
RE 4,50 diam. 9.30 RC 8.10
LE 7,00 diam. 9.30 RC 8.25
Just wondering if i could transpose this prescription to Menicon Z
yes no prob...just beware tho that Menicon Z lens is an ultra high DK lens much higher than Boston EO so you may get much more lipid and protein deposits.

IN my pro opinion i think Boston X02 would be a much better choice. Boston lenses are more flexure resistant.
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  #286 (permalink)  
Old 06-10-2012, 07:22 PM
Contact Lenses Forum - Freshman
 
Join Date: Jun 2012
Location: texas
Posts: 1
Default need help converting a glasses prescription to contact lens

Its my first time here n I would like to know if any one could help me to convert my eye glasses prescription its OD +025-50*163 OS -025 I would really appreciate it.
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  #287 (permalink)  
Old 06-10-2012, 11:08 PM
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Default

Quote:
Originally Posted by vixen84 View Post
Its my first time here n I would like to know if any one could help me to convert my eye glasses prescription its OD +025-50*163 OS -025 I would really appreciate it.
SORRY OP....u need to have those eyes also behind a "keratometer" to find out what base curve of the lens u need....translating dioptor readings is just one part of being fitted for contacts.
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  #288 (permalink)  
Old 06-12-2012, 03:42 PM
Contact Lenses Forum - Freshman
 
Join Date: Jun 2012
Posts: 2
Default Need help converting my prescription please

Sir Robin, could you possibly help me convert my glass rx to contacts?
OD= Sph -1.75, Cyl -.075, Axis 170
OS= Sph -0.75, Cyl -1.25, Axis 075

I jsut recently had this exam and my glasses are making my nose sore, even though they are light in weight. I would love to get contacts but I cannot afford another exam with my husband out of work. We rely on my paycheck so I have to do what I can as cheap as I can. That is why I got glasses to begin with. I appreciate your help!




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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  #289 (permalink)  
Old 06-12-2012, 03:43 PM
Contact Lenses Forum - Freshman
 
Join Date: Jun 2012
Posts: 2
Default Need help converting my prescription please

Sir Robin, could you possibly help me convert my glass rx to contacts?
OD= Sph -1.75, Cyl -.075, Axis 170
OS= Sph -0.75, Cyl -1.25, Axis 075

I just recently had this exam and my glasses are making my nose sore, even though they are light in weight. I would love to get contacts but I cannot afford another exam with my husband out of work. We rely on my paycheck so I have to do what I can as cheap as I can. That is why I got glasses to begin with. I appreciate your help!




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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  #290 (permalink)  
Old 07-16-2012, 08:13 PM
Contact Lenses Forum - Freshman
 
Join Date: Jul 2012
Posts: 1
Exclamation

Will someone please help me convert my eyeglass rx to contacts rx, please? I need it ASAP!!!!
OD: spherical: -4.50 cylindrical: -0.50 axis: 30
OS: spherical: -4.50 cylindrical: -1.25 axis: 140
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  #291 (permalink)  
Old 07-17-2012, 04:34 AM
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Default

Quote:
Originally Posted by luvbostonxo2's View Post
SORRY OP....u need to have those eyes also behind a "keratometer" to find out what base curve of the lens u need....translating dioptor readings is just one part of being fitted for contacts.
HelllOOloooo!?!?!?!?
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  #292 (permalink)  
Old 10-05-2012, 12:25 AM
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Join Date: Oct 2012
Posts: 1
Default Confused about prescription

Not sure if anyone will still reply. For some reason, my health benefits plan does not cover the cost of eye exams. I paid $95 out of pocket for one today and realised after that it would be another additional fee to get the optometrist to weigh in on how my contacts prescription would change. Did not pay for that.

Current eyeglasses prescription:

R: -3.75, -0.75 cylinder, 175 axis
L: -3.00, -1.50 cylinder, 165 axis

I am used to wearing just a spherical lens for the right eye. Previous contacts prescription for the right: -3.75 sphere.

Previous contacts prescription for the left: -3.00, -1.50 cylinder, 180 axis.

My questions are (a) should I boost the right eye to -4.00 for my new prescription (can't remember my last eye check up but I think it was at -3.50), and (b) should I stick with 180 axis for the left eye. I'm not sure why a 180 axis was recommended last time. Help me internets.
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  #293 (permalink)  
Old 10-05-2012, 06:11 AM
Contact Lenses Forum - Freshman
 
Join Date: Sep 2012
Posts: 3
Default can i get some help

just had my eyes checked and a script for glasses was wondering if i can get it converted to contacts this is the script right eye -075 -050 130 left eye -025 -050 065 thanks for ant help
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  #294 (permalink)  
Old 10-15-2012, 01:44 PM
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Default

There is more to a contact lens scrip than power. You can't get numbers like BC and DIA from your eyeglass scrip.
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  #295 (permalink)  
Old 10-28-2012, 10:24 AM
Contact Lenses Forum - Freshman
 
Join Date: Oct 2012
Posts: 2
Default Please help

Hello all. I'm 30 years old, and just got contact this past week for the first time in my life. My eye doctor told me to try the Acuvue 1 day Moist contacts, since they are hassle free.

My only problem is that once I'm wearing them, I'm having a hard time focusing/blurry vision, and have trouble with my reading/near vision. My near vision is great, I don't need any glasses to correct.

Here is the trial prescription she gave me for my contacts:

Left eye - Acuvue Moist for Astigmatism
D is -3.00 , Cyl is -0.75, axis 180, base curve 8.5, dia 14.5

Right eye - Acuvue Moist
-4.00, base curve 9.0, dia 14.2


I could see great out of my eyeglasses. My eyeglass prescription is
OD is -3.75, cyl +.25, axis 90
OS is -3.75, cyl +.75, axis 85

Did my eye doc give me the wrong contact prescription? Does it need to be tweaked? Any help is appreciated.

Thanks,
Tony

Last edited by honuswagner13; 10-28-2012 at 10:28 AM.. Reason: More Info
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  #296 (permalink)  
Old 10-31-2012, 04:34 PM
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Join Date: Oct 2012
Posts: 1
Default

somebody pls help me convert these..i have 2 prescriptions..one is mine and the other my daughters..we really want contacts but its too expensive to go get fitted for both of us...:-(

mine:
OD:-4.25/-5.25 064
OS:-1.75/-4.50 115

my daughter:
OD:-5.25/-3.00 180
OS:-3.25/-2.50 012

Thank u guys...it will greatly b appreciated!!
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  #297 (permalink)  
Old 12-04-2012, 01:03 AM
Contact Lenses Forum - Senior
 
Join Date: Aug 2010
Posts: 291
Default

Let's try to put things into perspective. If you wear a size ten shoe, does EVERY size ten fit you ????? NO !!!! Then WTF do you think contact lenses fitting is all about ??? It's NOT about the Rx numbers your Dr gave you and it's not about some chart on the wall. It's about a trained professional looking at how a lens fits and how good your vision is. I'm afraid there is no substitute. If you think it's worth permanent damage to your eyes in order to save a few bucks, then go ahead, knock yourself out. The three things a good fitter looks for are 1) FIT OF THE LENS !!!! 2) Quality of vision and 3) comfort, IN THAT ORDER !!!!
It boggles the mind that people will risk SERIOUS AND PERMANENT DAMAGE to their eyes to save a few dollars !!!
As I have said before, pay a professional to fit you properly !!! THEN if you must, order on-line, but have your lenses checked every six months.
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  #298 (permalink)  
Old 02-12-2013, 06:37 PM
Contact Lenses Forum - Freshman
 
Join Date: Feb 2013
Posts: 2
Default help!!!

Hello I just got new glasses and could not get a contact perscription at this time so it someone could help me convert my glasses perscription to contacts that would be very helpful Im not great with numbers... My perscription is- OD -5.75 cylinder-0.75 axis 054 and OS -6.00! What would my contacts be? Thank you for your help!
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  #299 (permalink)  
Old 02-12-2013, 11:05 PM
Contact Lenses Forum - Senior
 
Join Date: Aug 2010
Posts: 291
Default

Did you read any of the posts above ????!!!!

Quote:
Originally Posted by kvujevich View Post
Hello I just got new glasses and could not get a contact perscription at this time so it someone could help me convert my glasses perscription to contacts that would be very helpful Im not great with numbers... My perscription is- OD -5.75 cylinder-0.75 axis 054 and OS -6.00! What would my contacts be? Thank you for your help!
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  #300 (permalink)  
Old 02-12-2013, 11:33 PM
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Posts: 2
Default

Yes I read most of the above post but I was askin for someone to conver my prescription for me just in case my math is wrong!
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Other Contact Lenses 2 3, & Contact Lens Care 2 3 4 5 6 7 8 9 10 11

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