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Eyeglass tints and filters: What they can do for you

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The darker the eyeglass lenses, the better they protect your eyes from the sun. Is this true? Although it sounds logical, it’s false. “The degree of tint has no relation to the degree of protection from harmful ultraviolet (UV) radiation,” says Sarah Koester, spokeswoman for the Dusseldorf-based Central Association of Opticians and Optometrists (ZVA). Like UV radiation, UV filters are invisible. There are clear lenses with UV protection. Meanwhile dark-tinted lenses without a UV filter can actually do more harm than good, Koester warns. Because they let through less light, your pupils dilate, …

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