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uv protection: sunglasses can filter out uv rays and other harmful rays to protect the eyes from uv rays reduce eye strain: sunglasses can reduce eye strain and discomfort when the sun hits the eyes strongly. enhanced visual effect: different colors and materials of sunglasses lenses can improve visual effect, enhance contrast and color saturation fashion decoration: sunglasses are not just functional glasses, their frames and designs can also be fashion decorations, showing personality and fashion taste..syi