Zenni uses as their standard lens a "Thin and Light" material they say has an index of 1.57. Its optical properties are better than pure polycarbonate. I got a rimless pair from them with that lens material, and the one thing I found was that when I moved the lenses to another rimless frame, I got a little cracking when I tightened the nuts. That's probably something to watch out for with all lenses. It's tricky to get the lenses firmly in there and not do any damage. I suppose that's one reason we have professionals do this sort of thing, and why it's so disappointing when they screw up after charging us so much. --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://glassyeyes.blogspot.com!
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