The keratoplasty lens (i.e., OK lens) originated in the United States and has been used in 34 countries around the world after 50 years of development; it is a special inverse geometric design of the keratoplasty lens, the inner surface of which consists of multiple arc segments. The lens is unevenly distributed with the tear layer, and the resulting hydrodynamic effect changes the geometry of the cornea, which is worn at the front of the cornea while sleeping, gradually flattening the curvature of the cornea and controlling the lengthening of the eye axis, thus effectively stopping the development of myopia, and is known as “the technology that controls and corrects myopia while sleeping”. However, it is a reversible method, and after stopping wearing it, myopia will return to its previous level because the cornea has a memory function. The keratoplasty lens is made of a gas permeable rigid corneal contact lens material, commonly known as RGP material. It is developed on the basis of the non-breathable rigid material PMMA, which is commonly known as “plexiglass” or “acrylic” and is the earliest material used for rigid corneal contact lenses. Although it has a number of advantages, such as good optical properties, but because it is completely impermeable, patients can not wear it for a long time. In order to improve the breathability of rigid contact lenses and overcome the deficiencies in the physiological properties of PMMA lens material, researchers developed a breathable rigid material, RGP, by adding silicone (silicone acrylic material) or fluorine-silicone (fluorine-silicone acrylic material) to PMMA.