Check the label.: Most sunglasses sold in the US block 99%+ of the UV. They usually are signified by a tag or small sticker on the lens. If you are unsure, there are instruments in an optical shop which can test the lenses.
Answered 7/4/2017
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Label: Most sunglasses have a sticker or the tag indicates the level of u-v protection.
Answered 11/10/2012
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