Originating in the United States, keratoplasty lenses, also known as OK lenses and by several other names, such as MCT and CRT, are used in the treatment and control of myopia in children and adolescents, and are worn on the front of the cornea while sleeping to gradually flatten the curvature of the cornea and shorten the axis of the eye, thus effectively stopping the progression of myopia. The principle of keratomileusis: keratomileusis is a high oxygen permeability rigid corneal contact lens with a special reversed geometric design. Therefore, the process of wearing keratoplasty lenses gradually causes a physical change in the shape of the cornea through physical means. How do keratoplasty lenses work? Myopia is caused by light passing through the eye before the focal point is formed on the retina. Keratomileusis lenses change the shape of the cornea, flattening the central optical area of the cornea so that the focal point is imaged on the retina, similar to the principle of laser surgery, but it is physically shaped. How do keratomileusis curb myopia progression? This change in retinal imaging can improve the peripheral retinal defocus caused by the frame, thereby arresting the further lengthening of the eye axis and slowing myopia progression. Who is suitable for keratoconus? The best correction is within 600 degrees, with regular astigmatism below 150 degrees and irregular astigmatism below 100 degrees. They are suitable for young people under the age of 18 and for those who cannot undergo laser surgery in some special occupations. For monocular myopia, wearing keratoplasty lenses can reduce binocular aberrations and promote monocular function in both eyes. Doctor’s tip: Keratomileusis is an ophthalmic medical device product that must be worn only after a detailed examination of the corneal curvature and eye health by a professional ophthalmologist; the fit and corrective effect of keratomileusis lenses may vary depending on individual conditions; keratomileusis only temporarily changes the refractive state of the eye, and its main effect is to delay the deepening of myopia, but the original prescription will not disappear.