Optical quality is measured by something called an ABBE value. And, you're
right, polycarbonate makes for the worst quality optics of any commonly
available material.
Having said that, you stated in your first message that you already have
polycarbonate lenses in your existing glasses, and that you are happy with
them. It's obviously "good enough," and works well for you.
Probably not a big concern, for you.
-- Chuck Knight
On Tue, May 5, 2009 at 10:43 AM, PghGuy <[email protected]> wrote:
>
> Chuck--Thanks a lot for your very helpful advice. The thickness
> calculator showed me that I don't have much difference between one
> material and another. As I increased the size of the lens in the
> calculator, the edge thickness went up. I thought it was the other
> way around, that the smaller the lens, the thicker it would have to
> be.
>
> I'll look around and find the best deal. I have read that the visual
> acuity of polycarbonate isn't as good as plastic. Is it that much of
> a difference?
>
> With regard to my PD measurement, I'm considering calling the office
> of the optometrist from whom I got the prescription. I went to an
> independent OD inside a LensCrafters and they didn't seem bothered
> when I said that I wouldn't be getting glasses that day. Hopefully
> they won't get annoyed if I tell them that I'm getting glasses
> online. I don't know what the big deal would be if they are an
> independent office.
>
> Thanks again.
>
>
> >
>
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