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The most important benefit of wearing sunglasses is that they protect your eyes from ultraviolet (UV) light. UV light can have harmful effects on the eyelid, cornea, lens and retina They are usually made of a plastic or metal frame and two lenses that are darkened to filter out light. Sunglasses can have prescription lenses like eyeglasses, but they can also have lenses that are not for correcting vision. Shades is an informal word for sunglasses.