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sunglasses are a kind of glasses that can be used not only to play cool, but also to use its shading properties to make you look at everything on the surface.at the same time, it is also a kind of glasses that can block the sun"s rays. which are "labor insurance" products to protect the eyes under strong light. wearing this kind of lens can block ultraviolet and infrared rays. at the same time, the color of the external environment does not change, only the light intensity changes, as if it i strong sunlight contains a lot of ultraviolet and infrared rays, which may damage the cornea, lens, and even the fundus of the eyes. wearing a pair of sunglasses can block or absorb part of the light and reduce the irritation to the eyes. in recent years, due to the importance of health, many people like to wear sunglasses when going out in the summer to reduce the stimulation of the sun. some people also like to use them as decorations..syi