Frequency 55 Multifocal Contacts Annular Design

Blueyedblond · #1 (**permalink**) 04-24-2008, 12:08 PM

How many rings are there in a Frequency 55 Multifocal contact lens?

Nichobec · #2 (**permalink**) 06-15-2010, 12:15 PM

Quote:

Originally Posted by Blueyedblond

How many rings are there in a Frequency 55 Multifocal contact lens?

That's a tough one for me to answer, Blueyedblond. I tried an image search, but the best Google could do was pictures of the Frequency 55 Multifocal box. I would imagine, though, that they have a central zone with one ring around it, possibly two.

Blueyedblond · #3 (**permalink**) 08-10-2010, 01:53 PM

Quote:

Originally Posted by Nichobec

That's a tough one for me to answer, Blueyedblond. I tried an image search, but the best Google could do was pictures of the Frequency 55 Multifocal box. I would imagine, though, that they have a central zone with one ring around it, possibly two.

Well, that's the best (and so far only) answer I've gotten so far. Thanks for chiming in Nichobec.

Nichobec · #4 (**permalink**) 08-13-2010, 01:30 PM

Quote:

Originally Posted by Blueyedblond

Well, that's the best (and so far only) answer I've gotten so far. Thanks for chiming in Nichobec.

I'm glad I could help, but I could use some help from other members. Help me out here, folks! Blueyedblond here want to know How many rings are there in a Frequency 55 Multifocal contact lens.

Blueyedblond · #5 (**permalink**) 09-23-2010, 01:59 PM

Quote:

Originally Posted by Nichobec

I'm glad I could help, but I could use some help from other members. Help me out here, folks! Blueyedblond here want to know How many rings are there in a Frequency 55 Multifocal contact lens.

Thanks for your help Nichobec.

Now, we wait . . .

Nichobec · #6 (**permalink**) 09-28-2010, 02:23 PM

Quote:

Originally Posted by Blueyedblond

Thanks for your help Nichobec.

Now, we wait . . .

Still waiting . . .

Wierdscience · #7 (**permalink**) 09-29-2010, 02:00 PM

Quote:

Originally Posted by Blueyedblond

How many rings are there in a Frequency 55 Multifocal contact lens?

I found a website that had a table on if for CooperVision Frequency 55 Multifocal lenses. For "power" it said "+4.00 to -6.00 D in 0.25 D steps." I think that includes all the different powers that are available total, not just one lens. Then it said "Add powers (4) +1.00, +1.50, +2.00, +2.50." So do I take it that there are four rings? The picture seems to show three zones and a "lens edge." It's all right here: http://www.opt.indiana.edu/ce/clsoftbi/cooper.htm

Brittvid · #8 (**permalink**) 09-29-2010, 02:49 PM

Quote:

Originally Posted by Wierdscience

I found a website that had a table on if for CooperVision Frequency 55 Multifocal lenses. For "power" it said "+4.00 to -6.00 D in 0.25 D steps." I think that includes all the different powers that are available total, not just one lens. Then it said "Add powers (4) +1.00, +1.50, +2.00, +2.50." So do I take it that there are four rings? The picture seems to show three zones and a "lens edge." It's all right here: http://www.opt.indiana.edu/ce/clsoftbi/cooper.htm

Me, personally, if I've got distance, intermediate and near power, I wouldn't count the lens edge.

Knotlob · #9 (**permalink**) 09-29-2010, 03:26 PM

Quote:

Originally Posted by Wierdscience

I found a website that had a table on if for CooperVision Frequency 55 Multifocal lenses. For "power" it said "+4.00 to -6.00 D in 0.25 D steps." I think that includes all the different powers that are available total, not just one lens. Then it said "Add powers (4) +1.00, +1.50, +2.00, +2.50." So do I take it that there are four rings? The picture seems to show three zones and a "lens edge." It's all right here: http://www.opt.indiana.edu/ce/clsoftbi/cooper.htm

So the lenses almost work on the monovision principle in that the dominant eye is optimised for long distance, while the non-dominant eye is corrected (in the centre of the lens) for close vision. No wonder long distance vision will be a compromise over normal long distance vision correction. I guess there is always a trade off.

knotlob

Brittvid · #10 (**permalink**) 10-15-2010, 01:08 PM

Quote:

Originally Posted by Knotlob

So the lenses almost work on the monovision principle in that the dominant eye is optimised for long distance, while the non-dominant eye is corrected (in the centre of the lens) for close vision. No wonder long distance vision will be a compromise over normal long distance vision correction. I guess there is always a trade off.

knotlob

When they fit you for monovision, do they just ask you if you're right- or left-handed, or do they test you with an eye chart to see which eye is dominant?

Knotlob · #11 (**permalink**) 10-15-2010, 05:10 PM

Quote:

Originally Posted by Brittvid

When they fit you for monovision, do they just ask you if you're right- or left-handed, or do they test you with an eye chart to see which eye is dominant?

I don't know if an eye chart will tell you which eye is dominant, unless you are using both lenses. I guess they would just ask, but if the lens wearer didn't know, there is an easy way to determine the dominant eye. I've seen that in archery books, etc.

Lifted from another post here today:

"One can usually determine which eye is dominant by raising a thumb, holding it out in front of both eyes, and blocking an object with the thumb while both eyes remain open. Once the object is blocked, close one eye or the other, and the eye that cannot see the object is the dominant eye".

knotlob

AllyCat · #12 (**permalink**) 10-18-2010, 11:25 AM

Quote:

Originally Posted by Knotlob

I don't know if an eye chart will tell you which eye is dominant, unless you are using both lenses. I guess they would just ask, but if the lens wearer didn't know, there is an easy way to determine the dominant eye. I've seen that in archery books, etc.

Lifted from another post here today:

"One can usually determine which eye is dominant by raising a thumb, holding it out in front of both eyes, and blocking an object with the thumb while both eyes remain open. Once the object is blocked, close one eye or the other, and the eye that cannot see the object is the dominant eye".

knotlob

Not bad. That seems like a pretty simple test. Will your dominant eye always be your stronger eye? In other words, will your dominant eye always need less correction that your non-dominant eye?

Knotlob · #13 (**permalink**) 10-18-2010, 12:12 PM

Quote:

Originally Posted by AllyCat

Not bad. That seems like a pretty simple test. Will your dominant eye always be your stronger eye? In other words, will your dominant eye always need less correction that your non-dominant eye?

No, both my eyes require the same spherical correction but my right (dominant) eye has fractionally more astigmatism in it.

But with monovision they seem to correct your dominant eye for long distance (driving, etc.) and try to correct your non dominant eye for close vision (PC, reading, etc.), whilst still allowing the non dominant eye to have some middle distance vision.

knotlob

UNIT · #14 (**permalink**) 10-18-2010, 01:23 PM

Quote:

Originally Posted by Knotlob

No, both my eyes require the same spherical correction but my right (dominant) eye has fractionally more astigmatism in it.

But with monovision they seem to correct your dominant eye for long distance (driving, etc.) and try to correct your non dominant eye for close vision (PC, reading, etc.), whilst still allowing the non dominant eye to have some middle distance vision.

knotlob

Okay, right. I forgot that this question was about monovision. I hope AllyCat remembered. Thanks for pulling us back, knotlob.

Blueyedblond · #15 (**permalink**) 10-22-2010, 03:46 PM

Quote:

Originally Posted by UNIT

Okay, right. I forgot that this question was about monovision. I hope AllyCat remembered. Thanks for pulling us back, knotlob.

When a thread has 14 posts in it, it's easy to get sidetracked.

Nichobec · #16 (**permalink**) 11-05-2010, 04:40 PM

Quote:

Originally Posted by Knotlob

I don't know if an eye chart will tell you which eye is dominant, unless you are using both lenses. I guess they would just ask, but if the lens wearer didn't know, there is an easy way to determine the dominant eye. I've seen that in archery books, etc.

Lifted from another post here today:

"One can usually determine which eye is dominant by raising a thumb, holding it out in front of both eyes, and blocking an object with the thumb while both eyes remain open. Once the object is blocked, close one eye or the other, and the eye that cannot see the object is the dominant eye".

knotlob

A simple do-it-yourself test to determine which is your dominant eye. I suspect though, that if you ask you eye doctor for monovision lenses, he or she will still test you in the traditional way.

Knotlob · #17 (**permalink**) 11-07-2010, 01:42 PM

Quote:

Originally Posted by Nichobec

A simple do-it-yourself test to determine which is your dominant eye. I suspect though, that if you ask you eye doctor for monovision lenses, he or she will still test you in the traditional way.

So what is the dominant eye 'traditional way' test method/procedure?

knotlob

Eyeofharmony · #18 (**permalink**) 11-08-2010, 10:26 AM

Quote:

Originally Posted by Knotlob

So what is the dominant eye 'traditional way' test method/procedure?

knotlob

I'm guessing that Nicobec was referring to the good old fashioned eye chart on the wall.

Knotlob · #19 (**permalink**) 11-08-2010, 11:56 AM

Quote:

Originally Posted by Eyeofharmony

I'm guessing that Nicobec was referring to the good old fashioned eye chart on the wall.

I think that only determines visual acuity, not which eye is the dominant one.

knotlob

mayibfrank · #20 (**permalink**) 11-08-2010, 12:10 PM

Quote:

Originally Posted by Knotlob

I think that only determines visual acuity, not which eye is the dominant one.

knotlob

Isn't it true though, that if you can see more lines on the eye chart with your right eye, then that would be your dominant eye?

Knotlob · #21 (**permalink**) 11-08-2010, 01:03 PM

Quote:

Originally Posted by mayibfrank

Isn't it true though, that if you can see more lines on the eye chart with your right eye, then that would be your dominant eye?

No, my right eye is dominant, but I can see slightly better with my left eye. My RGP lenses correct the astigmatism fully in my left eye, whereas there is probably about -0.25D astigmatism uncorrected in my right eye.

I hope you see the difference

.

knotlob

Columbia · #22 (**permalink**) 11-08-2010, 03:40 PM

Quote:

Originally Posted by Knotlob

No, my right eye is dominant, but I can see slightly better with my left eye. My RGP lenses correct the astigmatism fully in my left eye, whereas there is probably about -0.25D astigmatism uncorrected in my right eye.

I hope you see the difference

.

knotlob

So much for mayibfrank's theory . . .

Wierdscience · #23 (**permalink**) 11-10-2010, 01:19 PM

Quote:

Originally Posted by Brittvid

Me, personally, if I've got distance, intermediate and near power, I wouldn't count the lens edge.

Well, I guess that's fair enough.

Blueyedblond · #24 (**permalink**) 12-02-2010, 01:21 PM

Quote:

Originally Posted by Knotlob

No, my right eye is dominant, but I can see slightly better with my left eye. My RGP lenses correct the astigmatism fully in my left eye, whereas there is probably about -0.25D astigmatism uncorrected in my right eye.

I hope you see the difference

.

knotlob

Wait a minute. Isn't your dominant eye the one that sees better, by definition? If your dominant eye is always the same as your dominant hand, then why test for dominance?

Knotlob · #25 (**permalink**) 12-03-2010, 04:58 AM

Quote:

Originally Posted by Blueyedblond

Wait a minute. Isn't your dominant eye the one that sees better, by definition? If your dominant eye is always the same as your dominant hand, then why test for dominance?

No, the dominant eye is not necessarily your sharpest vision eye.

I don't think there is any relationship between being right handed and having a dominant right eye.

The dominant eye is important for things like shooting and archery.

knotlob

packerbacker · #26 (**permalink**) 12-03-2010, 10:54 AM

Quote:

Originally Posted by Knotlob

So the lenses almost work on the monovision principle in that the dominant eye is optimised for long distance, while the non-dominant eye is corrected (in the centre of the lens) for close vision. No wonder long distance vision will be a compromise over normal long distance vision correction. I guess there is always a trade off.

knotlob

Not to disagree with you, but I don't see anything in that prescription above that indicates different prescriptions for each eye. It looks like the edges of each lens have a different prescription from the center.

mayibfrank · #27 (**permalink**) 12-21-2010, 04:13 PM

Quote:

Originally Posted by packerbacker

Not to disagree with you, but I don't see anything in that prescription above that indicates different prescriptions for each eye. It looks like the edges of each lens have a different prescription from the center.

You mean this prescription, right?

I found a website that had a table on if for CooperVision Frequency 55 Multifocal lenses. For "power" it said "+4.00 to -6.00 D in 0.25 D steps." I think that includes all the different powers that are available total, not just one lens. Then it said "Add powers (4) +1.00, +1.50, +2.00, +2.50.

packerbacker · #28 (**permalink**) 12-22-2010, 11:26 AM

Quote:

Originally Posted by mayibfrank

You mean this prescription, right?

I found a website that had a table on if for CooperVision Frequency 55 Multifocal lenses. For "power" it said "+4.00 to -6.00 D in 0.25 D steps." I think that includes all the different powers that are available total, not just one lens. Then it said "Add powers (4) +1.00, +1.50, +2.00, +2.50.

Yes, that's the one.

Wierdscience · #29 (**permalink**) 12-22-2010, 02:30 PM

Quote:

Originally Posted by Knotlob

No, the dominant eye is not necessarily your sharpest vision eye.

I don't think there is any relationship between being right handed and having a dominant right eye.

The dominant eye is important for things like shooting and archery.

knotlob

What determines which eye is the dominant one? I always thought it was the eye with the best vision, or at least the eye on the same side as your dominant hand. What makes one eye dominant over the other?

UNIT · #30 (**permalink**) 01-07-2011, 12:28 PM

Quote:

Originally Posted by Wierdscience

What determines which eye is the dominant one? I always thought it was the eye with the best vision, or at least the eye on the same side as your dominant hand. What makes one eye dominant over the other?

I suppose it's your Preference. It's usually on the same side as your dominant hand, but not always. As it was alluded to before, your dominant eye is the one you use when you do things like look through a telescope eyepiece or a camera viewfinder.