Sunglasses are a kind of glasses, which can not only be used to be cool, but also use its shading to make you look directly at everything on the surface. At the same time, it is also a kind of glasses that can block the sun's light. Sunglasses are eye protection products in strong light. Wearing this 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. It feels cool and comfortable like cloudy days.
Strong sunlight contains a lot of ultraviolet and infrared rays, which may damage the cornea, lens and even fundus of the eyes. Wearing a pair of sunglasses can block or absorb part of the light and reduce the irritation to the eyes. Because everyone attaches importance to health, many people like to wear sunglasses when they go out in hot summer to reduce the stimulation of sunlight. Some people also like to use them as decoration. There are many kinds of sunglasses, which should be selected according to different needs.