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Only you can decide which of this year's sunglass trends will work for you. Here are a few guidelines to buying the right lenses: Mirrored lenses have a thin layer of metallic applied to lens that may reduce visible light to reach eyes, but not UV rays. Gradients are tinted lenses that are darker on the top fading to no tint on the bottom. Polarized lenses cut glare from smooth surfaces such as water, snow or pavement. Photochromic lenses are sun-sensitive and transition from light to dark shade according to light conditions. Tints are a color called "neutral density gray" and change shade but not color perception.