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Lens material and what kind of?
    Optical lens points 1, 2, 3 PC piece of glass, crystal 4, polarizing films
Lens a: it's a big learning. There is no piece of polarized, glass, resin, can do polarizing films.Glass clear degrees than resin is high, but the first heavy, the second easily broken (even if is toughened glass).
    Resin is very strong of you, but first light many, the second easily have Nick. Tell you do lens good manufacturers. The glass buy pilkington, it do polarized glass, and is toughened glass, the quality is good, strong. Resin piece of buy baolilai, do a very famous plant resin polarizing pods winter are of very good quality too. The two are quite expensive, no Aaron frames, lens, I have been big brand of according to said, small sign too much, also do Wholesale New Era Hats not into the flow.
    PC piece of impact resistance ability. Lens and nylon, flexibility is good, but can't do polarizing, quality of a material of between resin and PC between piece. The Times with film like, can be folded...Big brands rarely. Class or resin piece of most expensive, good 5, 6 one hundred vice. That piece of with the other is not a class. In addition to that kind of expensive resin piece of other than the price can't, there are expensive and cheap. These are all in sunglasses stresses, PeiGuangJing didn't so much. Sunglasses and coating and coating the topic? The private you ask me again, knowledge too much.

    About crystal chips, this lens can't do sunglasses. Know why? And tell you some trade secrets. All say best crystal chips, heat ah, glasses comfortable. Not really a ultraviolet absorption, a bit of glasses benefit of not, natural crystal is * * * you! Here again have to say a secret, and really sunglasses ultraviolet prevention function is not main by coating coating, the wholesale Cheap sunglasses diaphragm these things. Do not believe your own tested and grab a piece of glass in the presence of the sun, to measure out ultraviolet prevention capacity to 90%, so UV400 sunglasses 100% uv are good to listen just, really uv the greatest impact is the lens itself, ha, ha, ha!