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Light reflected from surfaces like a flat road or smooth water is generally horizontally polarized. This horizontally polarized light is blocked by the vertically oriented polarizers in the lenses. The result is a reduction in annoying and sometimes dangerous glare. But what about snowcover? Some believe that the glare that results when sun reflects off snow can be reduced by polarized lenses. Others say that the lenses are not good for snow sports because they may not provide the contrast the eye needs to distinguish patches of ice or other snow formations that could be dangerous.