A large number of domestic and foreign clinical studies have proved that the effect of OK lenses for adolescent myopia treatment is positive and effective, and there are conditions: less than 600 degrees, less than 150 degrees of cis-routine astigmatism, less than 75 degrees of retro-routine astigmatism, myopia/astigmatism >2, flat corneal curvature value between 40-46D, central corneal thickness >500um (thick cornea, large shaping margin), treatment area diameter > dark pupil diameter ( not prone to glare), etc. The actual operation is slightly relaxed. OK lens (temporary) correction of myopia is one of the optional methods to relieve myopia, depending on the corneal elasticity, the degree of cooperation of children, and the rapidity of myopia progression, etc. It is generally used for children under 16 years old, and is not recommended for adults. As long as the prescription is standardized, regular review, and problems are seen in a timely manner, there is little harm to the cornea. The main problems found with OK lenses are: overly broad indications, irregular fitting, untimely follow-up, and irregular removal. Orthokeratology (OK lens) is only a trend to correct myopia, not as accurate as laser surgery to within 50 degrees. During the lens wearing period, the vision (degree) will also fluctuate, such as slightly clear in the morning. If you stop wearing OK lenses for various reasons (such as age, allergies, corneal damage), your prescription will rebound and your naked eye vision will decrease, so you will have to wear frames again. Usually the prescription will bounce back to the original level after 3 weeks of discontinuation.