Since the introduction of keratoplasty in China in the late 1990’s, keratoplasty is no longer an unfamiliar term with the increasing number of wearers. More and more parents want their children to wear keratoplasty lenses to achieve the goal of eliminating the need for frames during the day and controlling myopia development relatively effectively. ”Can our child wear OK lenses?” This is the most common question we are asked in the clinic. Unlike ordinary soft contact lenses, keratoplasty lenses are a type of rigid corneal contact lens produced using highly breathable rigid corneal contact lens material, which is precision cut by a CNC lathe according to each patient’s myopia and the curvature of the cornea. For safety and effectiveness, not all adolescents are suitable for these lenses and must undergo a rigorous screening and evaluation process. It is required that the wearer does not have any contraindications to wearing contact lenses: the child is generally required to be 7 years of age or older; to be within 600 degrees of myopia; to have less than 200 degrees of corneal astigmatism; to have a corneal curvature between 41.00 degrees and 46.00 degrees; to have a best corrected visual acuity of 1.0 or higher in one eye, and to have normal eye pressure. Why can keratomileusis reduce myopia? The design of keratoplasty lenses is different from soft lenses and regular daily wear rigid corneal contact lenses. The inverse geometric design of keratoplasty lenses allows the optical zone to be curved flatter than the corneal surface, mechanically flattening the cornea under transient eyelid movement and pressure. At the same time, the hydraulic effect of the thin tear layer on the posterior surface of the lens and the central anterior surface of the cornea causes some of the corneal epithelium under the lens to shift from the center to the periphery, i.e., the corneal epithelium is redistributed, forming a “concave lens” composed of corneal epithelium, thus correcting myopia. Simply put, keratoplasty is a method of changing the shape of the cornea in order to reduce the refractive power of the cornea and improve naked eye vision. The effect is reversible, and once you stop wearing keratoplasty lenses, the cornea will return to its previous state. Therefore, they must be worn every night to maintain clear vision. Currently, keratoplasty is also an irreplaceable non-surgical method for controlling the progression of myopia in young people, as will be explained in detail in a future article. Are keratoplasty lenses safe? This is the biggest concern of parents and the biggest concern of our dispensing staff. Most keratoplasty lenses are made of the highly oxygen permeable BOSTON (USA) material, which allows the cornea to “breathe with oxygen” at night. Compared to soft lenses, the material is also smooth, stable, has superior optical quality, is less prone to protein precipitation, and is less likely to cause allergic reactions. At night, the human eye is at rest and the eyelids are closed without transients, so the number of times the lens slides on the cornea is very small; compared to daily hard lenses, keratoplasty lenses have better comfort. A small number of wearers may experience a foreign body sensation during the initial period of wear (usually within 1 week), but if it does not interfere with sleep, there is no need to stop wearing them and the cornea will soon adapt. Secondly, keratoplasty is a Class III medical device, and keratoplasty is one of the most stringent medical practices regulated by the State Board of Pharmacy, requiring qualified physicians, qualified lenses and qualified patients to be successful. Therefore, the accuracy of screening and data measurement prior to fitting is particularly important. In addition, the safe use of keratoplasty lenses is also largely related to the user’s hygiene habits. Without good hygiene habits and conditions, wearing keratoplasty lenses is not recommended. When adolescents use them, parents must supervise or help their children to complete the cleaning and disinfection procedures according to specifications. At the same time, parents should have good compliance and, in addition to the regular follow-up visits necessary after fitting (on the first day and one week, one month, three months, and then every three months thereafter), if their child experiences eye discomfort during fitting, they should immediately remove the lenses and seek prompt medical attention. With good communication, understanding and cooperation between doctors and patients, we have proven with a large number of cases and clinical practice that keratoconus is controllable, safe and effective.