|Sep12-09, 09:50 PM||#1|
ways to tell the difference between hi-index lens and regular lens?
Recently, I purchased a pair of glasses from a privately owned optic store. I specifically asked for hi-index lens (1.56 or 1.60, I am not sure). The lens I got, however, is kind of thick (around 5 mm thick on the edges).My eye -sight is poor though, -5.00 sphere, -1.25 cylinder on the worst eye. Are there ways to tell if the lens is high-index or just plain regular lens, besides the thickness? Also, there are "rings" on the edge when I look parallel to the surface of the lens.
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