Re: [Phys-l] optical center : real-life physics

[physgoff@comcast.net]

Another anecdotal instance on Large vs.. Small progressive lenses. I have worn progressive lenses for about 15 years through 4 changes in lenses. Prior to this last set, they were all large format lensews. The most recent pair (about 3 weeks) is small. I'm fingding them usable, but far less satisfactory.
Jim Goff
 -------------- Original message ----------------------
From: "Polvani, Donald G." <donald.polvani@ngc.com>
> Thanks to BC for the following progressive lens reference: 
>
> > Here's another that semi-answerrs your question, I think.
>
> > http://www.eyetopics.com/articles/107/1/Progressive-Lens-Design.html
>
> 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.
>
> Don Polvani
> Northrop Grumman Corp.
> Undersea Systems
> Annapolis, MD  
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