CR-39 vs. polycarbonate

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murrayatuptowngallery@yahoo.com - 25 May 2007 15:14 GMT

Is there a rough estimate of thickness and weight savings offered by
polycarbonate lined bifocals over 'normal' (CR-39 I guess)?

I don't have my Rx handy but I think the worst eye is about
"-3.75 with 3 diopters of cylinder" as described to me.

Thanks

Murray

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michael toulch - 26 May 2007 17:44 GMT

On May 25, 10:14 am, murrayatuptowngall...@yahoo.com wrote:

> Is there a rough estimate of thickness and weight savings offered by
> polycarbonate lined bifocals over 'normal' (CR-39 I guess)?
[quoted text clipped - 5 lines]
>
> Murray

yes, the pc is index 1.6 and will be thinner and lighter (all things
being equal, ie frame shape and size). to put a % difference would be
difficult because of these variables but 30% is an educated guess.

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