In addition to the familiar laser myopia surgery, there is also a more effective way to correct youth vision – keratomileusis (OK lenses). But the principle of OK lens and its wear some attention is many users do not understand, we invited the Zhongshan Eye Center, Sun Yat-sen University, optometric specialist Yang Xiao, associate professor of OK lens knowledge for everyone. The keratoplasty lens is easy to use but requires strict fitting techniques OK lens is a specially designed rigid, breathable contact lens with a smaller diameter than ordinary soft contact lenses. According to Prof. Yang Xiao, “OK lenses are very convenient, they can be worn at night while sleeping and removed in the morning to achieve clear daytime vision without any glasses, and they are also an internationally recognized method of delaying the deepening of myopia in adolescents. The first thing you need to do is to get a good idea of what you are looking for. Professor Yang Xiao said: “Patients wearing OK lenses must be fitted in qualified medical institutions, by qualified ophthalmologists to follow strict fitting procedures to determine the lens parameters for correction, in addition, the wearer needs to be regularly reviewed to avoid adverse reactions and complications. OK lenses can effectively delay the deepening of myopia in young people but cannot completely cure myopia OK lenses are easy to use and are welcomed by many parents and children, but some parents bring their children to wear OK lenses with the expectation that “wearing OK lenses will completely cure myopia”. But Professor Yang Xiao introduced, OK lenses only temporarily change the refractive state of the eyes, the original myopia will not disappear. Although, OK lenses can not completely cure myopia, but can effectively inhibit the youth myopia deepening. According to Prof. Yang, “According to observations, the average annual myopia deepening in adolescents wearing frames is 68 degrees, while the average annual myopia deepening in adolescents wearing OK lenses is 16 degrees.” The OK lenses can also cause complications when worn improperly. In addition to wanting to understand the principle of OK lenses to correct myopia, there are many people who are interested in the safety of OK lenses. “ But at the same time, Professor Yang Xiao also said, because the OK lens lens using special high oxygen permeable material, if strictly follow the scientific wearing method, can minimize the possibility of complications, and most complications can be recovered by suspending wearing. Professor Yang reminded that “choosing a regular lens-wearing hospital and regular follow-up is an effective way to avoid complications.”