Popular science glasses.Nowadays, more and more people like to wear glasses, it is not difficult to find that many stars will specially wear a pair of glasses in order to pose, and some people will wear glasses in order to be more bookish, in short, wearing glasses has become a fashion, but some do choose special functional glasses to correct vision or protect the eyes because of myopia, presbyopia and so on. So, what kinds of glasses are there?
Sunglasses, also known as sunglasses, sunglasses, is designed to protect the eyes of the glasses, the lens is often black or dark, to avoid the sun to stimulate the eyes. Can also be used as a fashion hipster beauty or reflect the personal style of the special accessories.
Myopia glasses. It is mainly the use of concave lens with appropriate focal degree, so that the light is properly divergent through the concave lens, and then refracted by the eye to form a clear image on the retina. Myopic glasses have a certain preventive effect on complications caused by high myopia.
Presbyopia is a convex lens designed to correct the degenerative presbyopia of the eye's lens. Reading glasses, like myopia glasses, have many optical indicators stipulated by national standards, and there are some special rules of use.
