Spectacle lenses are the main equipment for vision correction of myopia. There are mainly two categories: CR39 and PC. They are divided into transparent ordinary lenses, color-changing lenses, dyed lenses, and polarizing lenses. For cleaning and other functions, the choice of light, beautiful and thin lenses is mainly considered from the lens refractive index, film layer, material and power. There are also TAC lenses and photochromic lenses for sunglasses