The term keratomileusis may be unfamiliar to most myopic friends, but mentioning OK lenses may be more familiar, this is because he was once popular in earlier years, but due to improperly carried out to some myopic patients cornea caused serious injury to a rigid corneal contact lenses, keratomileusis (orthokeratology) is OK lenses, but we should not first on his In fact, the damage caused by OK lenses to myopic patients in the past was due to improper application, inappropriate indications and the blind pursuit of economic benefits. A metaphor knife can hurt people but after the injury is not the fault of the knife, but with the knife to do bad things should be punished and not throw the knife together, with the production of keratomileusis material biological properties to improve the design principle of the improvement, this technology in recent years and a new vitality, so we have to look at it correctly again, for keratomileusis right name. Let’s first understand the principle of treatment: myopia is caused by an extra-long eye axis or steep corneas, resulting in the imaging of visual objects in front of the retina. With keratomileusis, a layer of unevenly distributed tears is sandwiched between the lens and the outer surface of the cornea, and the hydrodynamic effect of the tears pulls the central corneal epithelium toward the middle periphery (outside). At the same time, the eyelid action causes the central lens to exert some pressure on the lower cornea when the eye is closed and blinked. These two effects result in a flattening of the central corneal curvature and a thinning of the central epithelial layer, a shift of the visual imaging point closer to the retina, and a reduction or even elimination of myopia. This special contact lens, called an OK lens or orthokeratology contact lens, is made of high-tech materials with good oxygen permeability and is specially designed by computer based on each patient’s examination data. This method does not require surgery, is safe to use, easy to operate, and has quick results. Treatment effect: Generally speaking, the average reduction after two hours of wearing the lens is about 100 degrees; the first night of wearing the lens can reduce about 300 degrees; the maximum reduction can be reached after one week of wearing the lens; the stable and clear naked eye vision can be maintained for one day after two weeks of wearing the lens, and the correction period is over. During the maintenance period, it is necessary to wear the lenses regularly according to the user’s own vision rebound fast and slow to maintain the corrective effect. For most users, it is still necessary to wear it every night, but for a few users with low myopia, it can be worn every other night or even every two nights to maintain good daytime naked eye vision. The results of keratoplasty are encouraging and the safety of the procedure has been confirmed by experts. Treatment Procedure: OK lens correction consists of three stages: examination, correction and maintenance. First, patients are examined to determine if they are suitable for correction; then they are fitted with custom-made OK lenses during nighttime sleep on a schedule. The best correction is usually achieved within 1-2 weeks; finally, when the doctor confirms that the vision has been restored to its best, the patient will continue to wear the lenses for 4-12 months. In order to maintain the corrective effect in the long term, different patients can intermittently wear them as appropriate. The advantages of OK lenses for vision correction are: short-term vision improvement; good reduction of myopic refractive error, eliminating the need for glasses or contact lenses; easy to operate and convenient to use; inhibiting the development of progressive myopia in adolescents; meeting the requirements of certain special professions (such as athletes, divers, pilots, actors, police, military, etc.) for distance vision. The most critical tip: Keratoplasty is a myopia correction and myopia control technique, a medical practice that must be performed under the guidance of a physician. It designs a special rigid corneal contact lens based on the myopic user’s corneal geometry and refractive error. The lens is processed and made of highly breathable material, and after the user wears it for 8-10 hours a day, the eyes are in a non-myopic or reduced myopic state for the rest of the day, without any glasses. If users wear the lenses at night, they do not need to wear glasses during the day. Keratoplasty is suitable for myopic patients of all ages who need it. People with low to moderate myopia within 600 degrees can significantly improve their vision, and it is also safer, and teenagers can effectively curb their rapid myopia progression. The professional skills of the keratoplasty fitter are very important and should be performed in a hospital by a professionally trained ophthalmologist or optometric professional. In addition, the safe use of keratoplasty lenses is largely related to the hygiene habits of the person using them. Without good hygiene habits and conditions, wearing keratoplasty lenses is not recommended. When adolescents are using them, parents must supervise their children to complete the cleaning and disinfection procedures according to specifications. People with fundus disease, dry eyes, and active inflammation are not able to wear them.