Glasses are made up of lenses and shelves, which are worn in front of eyes to improve vision, protect eyes or make decorations. Glasses can correct a variety of vision problems, including myopia, hyperopia, astigmatism, presbyopia or strabismus, amblyopia and so on. Glasses consist of lenses and frames. There are 15 kinds of myopia glasses, hyperopia glasses, reading glasses, astigmatism glasses, flat glasses, computer goggles, goggles, night vision goggles, goggles for e-sports games, sunglasses, toy glasses and sunglasses. There are also special glasses for viewing 3D stereoscopic images or virtual real images.
Other types of glasses include goggles, sunglasses, goggles, etc. , provide all kinds of protection for the eyes. Modern glasses usually have a nose pad in the middle of the lens and a cushion where the left arm and right arm rest on the ear. People who love beauty or are not used to wearing glasses can choose to correct their vision with contact lenses. In the history of our country, with the development of individual handicraft industry, the materials used in glasses have changed from natural crystal stone to glass, and the scope of use of glasses has begun to spread and expand to the people, and the manufacturing technology has also made new progress.