> On Sep 3, 11:31 pm, bumpylight <[EMAIL PROTECTED]> wrote:
>
> What am I doing wrong?
I think you are over analyzing. Try on glasses until you find a frame
that is stylish and comfortable. Check to see if your pupils are
centered in the lenses. If they are, you've found your frame/lens
measurements. In other words use your technique to find your bridge
distance, [17mm (which is the bridge distance which seems to
work for me from trying on eyeglasses in a Wal-Mart store)] for all
the frame measurements.
Mathematically, I don't understand why you subtract the bridge
distance from your PD. I think you should be subtracting only one-half
the bridge distance. Using your formula this would yield an overall
frame width of 150mm.
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