RGP is hard oxygen permeable corneal contact lens, is a kind of contact lens, with “breathing contact lens” reputation, for daytime wear to correct myopia, hyperopia and astigmatism and other refractive errors. The advantages of RGP: 1, the biggest advantage of high oxygen permeable structure, healthier, significantly higher safety than soft lenses (ordinary contact lenses); 2, high imaging quality, significantly better than frame glasses; high refractive error patients more significant; 3, a certain degree of prevention and control of myopia development, adapted to adolescent myopia patients; 4, special patient treatment: cone cornea, large astigmatism and various irregular astigmatism, aphakic eyes, etc. The treatment of special patients The keratoplasty lens, or OK lens, is a specially designed rigid gas permeable corneal contact lens worn by patients at night, which can produce a shaping effect on the cornea, flattening the central optical area of the cornea, thus reducing the degree of myopia and astigmatism. Advantages of keratomileusis: 1, easy to use, only need to wear at night while sleeping, the next day you can restore normal vision. 2, can partially prevent and control the development of myopia, and the efficacy of the exact, suitable for adolescent myopia patients. 3.The shaping process is reversible and does not cause irreversible changes to the cornea. 4, as long as the standard wear, regular inspection, the safety of the corneal plastic lens is guaranteed.