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 made up of lenses and frames, which are used to improve vision, protect eyes or for decorative purposes. Glasses can correct a variety of vision problems, including myopia, hyperopia, astigmatism, presbyopia, strabismus or amblyopia.