It is a new type of youth myopia prevention glasses, it is through a physical shaping method, through a reasonable, programmed special design of a rigid keratoplasty lens, night, wear it on the surface of the eye, and then make the cornea in accordance with the reasonable shape we set the deformation, through the corneal shape change can make the youth original myopia, astigmatism some problems to get special effective correction, so that the night wearing the lens, the purpose is to make the myopic cornea into mild myopia or become non-myopic cornea, during the day, the youth because of the corneal shape change, so myopia reduced or disappeared. The purpose of wearing glasses at night is to make the myopic cornea become mildly myopic or not myopic, and during the day, myopia is reduced or disappears because the shape of the cornea has changed, and if used for a long time, myopia can be controlled to a certain extent, and the effect of prevention and treatment of myopia can be achieved. Currently, this is a new technology that has been researched abroad to treat and prevent myopia from worsening, especially for controlling myopia in teenagers. The principle of keratoplasty: Generally speaking, soft things will change shape with hard things, our eye cornea is soft, myopia prevention keratoplasty hardness is higher than the corneal hardness, so in the process of wearing the lens, it will gradually make the cornea through physical methods to change its shape, this phenomenon is actually the principle of ophthalmology scientists to invent keratoplasty, foreign countries in recent years with the use of In recent years, foreign countries have been using this method to prevent and control myopia by creating a reasonable shaping treatment for the cornea. The long-term use of keratoplasty lenses will not cause any special adverse effects on the eyes, but the prerequisite for safety is that they should be worn in accordance with the doctor’s instructions and under the premise of scientific and standardized use, which can achieve a safe and effective effect. Therefore, rigid keratomileusis is a safe and effective way to prevent myopia in adolescents. Children and adolescents who do not have good results with frames and whose myopia is growing rapidly; children with myopia and astigmatism, especially those with high refractive error; children whose parents are highly myopic and whose children have a genetic tendency; and children who have the best quality and most advantageous optical lenses for the treatment of myopia, are all suitable for wearing keratoplasty lenses. The prerequisite for safe eyeglass wear is to use them under the guidance of an ophthalmologist and to have a scientific fitting and use procedure in a regular hospital. It is safer for children and adolescents to receive regular review and maintenance from an optometrist. In addition, myopia that has already occurred cannot be eliminated by wearing keratoconus.