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Not all sunglasses are created equal, just as not all cameras, microwaves, cars, etc. are as good as others. Although most sunglasses now offer UV ray protection, there are different classifications of UV proection, just as in suntan lotions. Many of the cheap sunglasses offer the least protection, and use a spray-on film on the surface of the lens to achieve this. This allow the protection to scratch or wear off. Quality sunglasses have this technology integrated into the lens itself. Additionally, most cheap sunglasses to not offer polarization, a feature which allow much of the sun's glare to be filtered out. The cheap ones that do claim this also use a surface layer for the polarization.

2006-08-07 19:13:22
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