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Women Glasses Retro GlassesVintage Round Sunglasses for Women Classic Retro Glasses UV 400 Lens How can I find inexpensive sunglasses that are guaranteed to block 100 percent UV? Many are made in China and say 100 percent UV protection. But how do I really know? The amount of UV protection that sunglasses provide cannot...

Vintage Round Sunglasses for Women Classic Retro Glasses UV 400 Lens 

How can I find inexpensive sunglasses that are guaranteed to block 100 percent UV? Many are made in China and say 100 percent UV protection. But how do I really know?

The amount of UV protection that sunglasses provide cannot be determined by the color of the lenses, the country of origin or the price of the eyewear. The determining factor is the lens material and any additional UV-blocking coatings that may be applied. Uncoated plastic sunglass lenses block about 88 percent UV; polycarbonate lenses block 100 percent UV.

Many cheap sunglasses use a material called triacetate. This material absorbs only about 40 percent of the UV rays. Lenses may also be made of other acrylic materials, which will vary in how much UV protection they provide.

All sunglasses with polarized sunglasses block 100 percent UV, regardless of the lens material or price of the eyewear (though polarized sunglasses tend to be more expensive than sunglasses without this extra glare-blocking feature).



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