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Thanks to BC for the following progressive lens reference:
Here's another that semi-answerrs your question, I think.
This references discusses the effect of making lenses smaller on
progressive lens performance. I have worn progressive lenses (Varilux)
for a number of years now with large lenses. My wife tried progressive
lenses last year with a pair of modern (small lens) frames. She
couldn't adjust and had to go back to bifocals. When I mentioned the
possibility of the smaller lens making the lens design more difficult
(and the adjustment more difficult) the optician said no.
I have just ordered a new pair of progressive lenses (still Varilux) in
a smaller lens frame. I will find out first hand any differences in
performance (or ease of adjustment) between my present large frame or
the new small frame lenses.
Northrop Grumman Corp.
Annapolis, MD _______________________________________________
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