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From the function of lens, it has the function of adjusting the amount of light entering the eyes, correcting vision, protecting eye safety and clinical treatment of eye diseases. Children's strabismus caused by abnormal refraction and patients with abnormal refraction accompanied by headache can be treated after wearing glasses. The function of the glasses frame is not only to form glasses for matching lenses, but also to provide beauty and decoration. Modern fashion advocates emphasize that glasses should be in harmony with the facial makeup and clothing of the people of the times, reflecting the high social class, high learning, fashion and other symbols.

Glasses are composed of lenses and frames. According to the purpose of glasses, there are 15 kinds of glasses, including myopia glasses, hyperopia glasses, presbyopic glasses and astigmatic glasses, flat glasses, computer goggles, goggles, goggles, goggles, night goggles, sports goggles, sports goggles, goggles, sunglasses, toy glasses and sunglasses. There are also special glasses for viewing 3D stereo images or virtual reality images. Other types of glasses include goggles, sunglasses, swimming goggles, etc., providing various protective effects for the eyes. Modern glasses are usually equipped with a nose support in the middle of the lens and a cushion in the position where the left and right arms rest on the ear. People who love beauty or are not used to wearing glasses can choose to correct their vision with contact lenses.