We discussed this a long time ago...trying to figure out the right
"theoretical" sized frame for a person, based on PD.
Premise: The eyes should be horizontally positioned in the center of the
lenses.
My PD is 61mm (I think...don't have it in front of me). Therefore, the
bridge, plus 1/2 of the left lens, and 1/2 of the right lens should equal
61mm.
That means that (lens width) + (bridge) = PD should provide the theoretical
perfect size.
Let's take a pair of Windsor frames. 40mm lens plus 25mm bridge, as
mentioned in the previous post. That would give a "perfect" dimension of
40+25 = 65mm. My PD, is 61mm. Tiny as those lenses might be, that frame
would be too wide for me...but only by a few mm, so it'd probably work just
fine.
See how it works?
-- Chuck Knight
On Sun, May 10, 2009 at 8:12 PM, Paul <[email protected]> wrote:
>
> Do you need a wide lens or a wide frame? Some frames compensate for a
> smaller lens by using a wider bridge. Those old-fashioned 40mm Windsor
> (round) frames often had a 25mm bridge.
> >
>
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