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Polarized lenses are really beneficial when used for prescription sunglasses. The main benefit of polarized sunglasses is that they block the glare that results from sunlight bouncing on surfaces like water, pavement, and snow. These lenses filter the light waves that cause the glare, but allow other types of light wave in, so the wearer can enjoy the bright, sunny day, but doesn't have to strain their eyes by squinting against sunlight.