PC SF SV blue cut Photochromic lens--In summer, the light is strong, people are used to wearing colored glasses to resist the strong sunlight when they go out. However, the people with myopia can not wear colored glasses, which brings a lot of trouble to the people with myopia. The photochromic lens, in the case of sunlight, can change color, block the dazzling light, prevent the direct light, play a role in protecting the eyes; In the room with soft light, photochromic lenses become as transparent and colorless as ordinary lenses, which can solve the problem of myopia people can not wear colored glasses. Moreover, with the development of science and technology, there are anti glare lenses on the market, which can reduce the damage of glare to eyes.