How to choose glasses

summary

What kind of materials do the eye lenses have? To compare which kind of myopia glasses is the best, you need to know what kind of myopia glasses are. The specific model and type should be determined according to the individual situation. Let me introduce it.

How to choose glasses

First, the types of myopia lenses can be divided into inorganic materials and organic materials from the use of materials; from the development of myopia lenses can be divided into: natural crystal lenses; optical glass lenses; optical resin lenses. In the correction of myopia at the same time, and can best protect the eyes of the lens is the best myopia glasses.

Second: myopia glasses which kind of lens is the best, need from the imaging effect, whether to prevent eye fatigue, whether to prevent harmful ultraviolet three aspects. Crystal pieces can't effectively prevent ultraviolet rays, and there are many natural minerals and impurities in them, so the optical imaging effect is not good. Now they have been basically eliminated. Glass lenses can only prevent ultraviolet rays to 350nm, and the wavelength of ultraviolet rays is 295-380nm. Resin lenses can prevent ultraviolet rays between 350nm and 380nm (some can prevent ultraviolet rays above 380nm).

Third: of course, there are many kinds of film to choose from. After the film treatment, it can increase the surface hardness of the lens and prevent eye fatigue. At present, glass lenses and optical resin lenses are widely used in the market. Glass lens has high hardness and good wear resistance. Generally, its quality and parameters will not change with time.

matters needing attention

The quality of myopia glasses is not directly proportional to the price. Short sighted people should not be greedy for cheap glasses, nor blindly seek the highest price to wear unsuitable glasses. They should go to a professional eye hospital for examination, and wear suitable and cost-effective glasses according to their own eye conditions.