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Why we need buy a pair of sunglasses,A pair of sunglasses looks very simple, that is some kind of plastic or metal frame,but a good sunglasses can protect your eyes,there are four reason.First,Sunglasses can prevent sunlight in the ultraviolet. Second,sunglasses to prevent light exposure.Third,brand Sunglasses cheap to prevent glare exposure.Fourth,Sunglasses can eliminate specific frequencies of light.So,When buying a cheap sunglasses, you have to give up these four advantages, I would rather buy a expensive sunglasses,what about you?