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Toric Contact Lens fitting Question
A question to help me understand my contact lens fitting.
I wear Toric Lenses to correct Astigmatism. Recently, I went through a prescription update and all is now good, but I don't understand the way we arrived at the final lens that worked in my left eye, which has been difficult to fit for over 30 years.
My question is why final lens worked vs the trial lens I started with.
In that eye, the fitting that worked is BC 14.4, Dia 14.4 Pwr -7.00, Cyl/Axis -2.75x155. This required a Toric XR lens from Cooper Vision (the same lens type I have been wearing for ~15 years. With this lens I still require reading glasses, but that is expected. Fit and comfort is excellent.
The trial lens differed only in the power. It was Pwr -8.00 (vs -7.00). With the trial lens, comfort was excellent and there was no ghosting, etc, but vision at all distances wasn't good. What was confusing was that when trialing it and wearing my reading glasses (+1.50), distance vision became excellent, but short distance was still poor & I needed a pair of +3.00 reading glasses to be able to read text on a computer screen pr a printed page.
I'm confused why reducing power, with no other changes to the lens, would result in a lens that focused properly - I had expected after finding vision improved with my readers that the move would have been to a higher power lens to correct vision, rather than a lower powered one, but clearly that wasn't correct. Why?
I wear Toric Lenses to correct Astigmatism. Recently, I went through a prescription update and all is now good, but I don't understand the way we arrived at the final lens that worked in my left eye, which has been difficult to fit for over 30 years.
My question is why final lens worked vs the trial lens I started with.
In that eye, the fitting that worked is BC 14.4, Dia 14.4 Pwr -7.00, Cyl/Axis -2.75x155. This required a Toric XR lens from Cooper Vision (the same lens type I have been wearing for ~15 years. With this lens I still require reading glasses, but that is expected. Fit and comfort is excellent.
The trial lens differed only in the power. It was Pwr -8.00 (vs -7.00). With the trial lens, comfort was excellent and there was no ghosting, etc, but vision at all distances wasn't good. What was confusing was that when trialing it and wearing my reading glasses (+1.50), distance vision became excellent, but short distance was still poor & I needed a pair of +3.00 reading glasses to be able to read text on a computer screen pr a printed page.
I'm confused why reducing power, with no other changes to the lens, would result in a lens that focused properly - I had expected after finding vision improved with my readers that the move would have been to a higher power lens to correct vision, rather than a lower powered one, but clearly that wasn't correct. Why?
MEDICAL PROFESSIONAL
That is not something that has an explanation that is universal. You should discuss it with the 'doctor' that fit your contact lens.
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