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contact lense toric diameter 14.0, 14.2 & 14.5 question?
My Doc only uses (pushes) acuvue contacts. we found i CAN NOT wear them, my eyes do not like them. they are all 14.5 . I mention 1-day wear for torics (Focus Dailies), he had to look it up at 1-800-contacts, he didnt believe me that they even made a 1-day toric contact ( i told him their are 3 or 4 out their). Any way those had a 14.2 diameter ( i asked him he said its just the diameter its not a big deal). well they did nt have my exact numbers, so he fudge a few others and now i have them. they fit great and comfortable, but the prescription is not right (more money down the tubes). I found a brand PUREVISION TORIC (great reviews, numbers will work) and even a tiny bit smaller diameter (14.0 even). I think smaller diameter is less eye coverage which i think means more comfortable. My question??? from others experience, if a 14.2 is fine from a a 14.5, then wound not a 14.0 be fine from a (perfect fit 14.2)?
chuck
3 Answers
- Anonymous10 years agoFavorite Answer
==EDIT== I see you've been helped heaps by Footprintz =)
His answer here (http://au.answers.yahoo.com/question/index;_ylt=Av... is the best one - different material and properties have a far greater effect than just BC steepness and Diameter alone.
Doesn't really change my answer below... maybe Footprintz can correct me where I'm wrong? =)
**Original Post below**
G'day mate :) As an optometry student learning about contact lens, I'm going to side with your Doc here: lens diameter has a SMALL effect overall. What you should be concerned about is the Base Curve - the steepness factor.
In terms of fitting, soft contact lenses worry about 3 dimensions: the steepness Base Curve, the size Diameter, and the prescription - which in your case, has a sphere, a cyl and an axis (hey, like me *hi 5*)
Anyways - the predominant one is the Base Curve: a "steep" lens has a low BC number of 8.5 or less, which may be excessively tight. Looser ones have a BC of 8.7 or more, and may feel "loose" or "floppy" on the eye. Focus Dailies and Purevision Toric (from memory) are a 8.6 or 8.7 - look that up for me will you? Whereas Acuvue Daily torics are in 8.5, Oasys Toric 8.6.
Lens diameter is then a secondary effect of the Base Curve: a larger lens is usually more stable than a smaller lens, however a "loose and large" lens will be irritating to the eyelids. Likewise, a tight-fitting lens would be optimised by a small size, but "small and too tight" is another problem.
I'd love to hear back from you - can you describe how your lenses feel right now? Specifically: (when you wear them, do you...)
1. Vision: is it clearer before or after you blink?
2. Size: Do you get the sense that your eyelid is rubbing on it.
3. What exactly is the think you're unhappy with the contacts - any itching or other symptoms?
All of it will help narrow it down thanks =)
PS - all us optoms will have a "favourite" lens - we're not getting any kickbacks, it's just that in our experience there will always be a lens that fits 90-95% of our customers. It's that 5% that we should go the extra mile for... which your Optom is being a tad lazy about.
- Anonymous5 years ago
1
Source(s): Improve Your Vision Naturally - http://improveeyesight.uzaev.com/?IlIs