The increasing prevalence of myopia and its progression to a younger age has made myopia a public concern. Currently, the prevalence of myopia among adolescents in China is as high as 40%. Once myopia sets in, it is irreversible and gradually deepens. Many parents worry about their children’s myopia deepening year after year, sometimes resorting to various instruments, and sometimes running around for massage and medicine. However, over the years, the myopia of children still increases. So, is there any way to control the increase of myopia in children? The answer is yes, the OK lens. OK lenses (orthokeratology), also known as keratomileusis, were introduced to China in 1998 after being used in large numbers in Western countries since the end of 1996. The principle is to use the new biological materials in aerospace technology to make a highly transparent and orthokeratology contact lens with a special design by computer, which can reshape the cornea gently, painlessly and without damage, so that the central part of the cornea tends to be flat, thus achieving the purpose of correcting myopia, improving natural vision and restoring the eyes to a clear state. The mitigating effect of Ok lenses on myopia was first seen in the 1960s, when optometrists observed that people who wore rigid contact lenses experienced a decrease in myopia after removing them. After decades of development. OK lenses can improve vision in a short period of time; myopia refractive error reduction is so effective that it is mostly possible to eliminate the need for glasses or contact lenses; they are easy to operate and convenient to use; the risks are very small and other eye functions are not affected; and more importantly, they have an inhibitory effect on the progressive myopia of adolescents. The disadvantage is that the degree of myopia will return to the original state after stopping wearing. 1.What are the suitable people for OK lenses? A: Myopic 500 degrees or less, regular astigmatism less than 250 degrees, hope that myopia stabilization will not deepen; engaged in special requirements for vision occupations (such as police, aviation, etc.) but suffer from myopia; highly unequal myopia patients; do not like to wear frame glasses myopia patients; not suitable or unwilling to surgery (including laser surgery), but also hope to remove glasses myopia patients. 2.Who are not suitable for wearing OK lenses? A: People who are farsighted, suffering from acute conjunctivitis, corneal disorders, dacryocystitis, glaucoma, various fundus diseases, amblyopia, serious systemic diseases such as diabetes, rheumatism, unable to ensure standardized cleaning and handling of lenses, and those who are not capable of taking care of themselves are not suitable for wearing OK lenses. Those who have been wearing contact lenses need to stop wearing them for 2-3 weeks before trying OK lenses; those who have undergone keratoconus surgery need to consult with an ophthalmologist. 3.How should regular OK lenses be worn and used? A: OK lenses should be fitted by a registered optometrist or ophthalmologist. During the fitting process, at least computerized and comprehensive optometry, corneal curvature testing, tear examination, slit lamp microscopy, intraocular pressure testing, fundus examination and corneal topography examination should be carried out. 4.How should I use OK lens correctly? A: Within 3 months of first wearing OK lenses, you should go to the dispensing office to receive regular and comprehensive review at least 5 times according to the prescribed time. After 3 months of wearing OK lenses, you should still have a regular review. It is important to maintain personal hygiene while wearing the lenses and to wash your hands when handling the lenses. Make sure to put a lot of drops of eye lubricant on the inside of the lens before wearing the lens, and make sure that there are no air bubbles under the lens after wearing the lens.