Advantages and disadvantages of orthokeratology First of all, orthokeratology appeared in the American market in the 1990s, and it is called OK lens. Later, it was introduced to China. I gave up at first, because the cornea was damaged, and if it was not properly cared for, it might cut the cornea and cause secondary infection. This is a very obvious shortcoming. As for returning to the market in the future, in addition to improving the quality and materials, there are also benefits and advantages that cannot be ignored, such as wearing it when sleeping and not wearing it during the day, which can maintain stable vision. For athletes, actors, or children on campus, it is really a good thing to run freely in the sun without wearing glasses during the day, so it is considered to have obvious advantages. In addition, big data shows that it has a certain effect on delaying the progress of myopia in children. Although we can't deify the relative role, we need more data to prove it. As for the shortcomings, except that improper nursing may cause corneal damage, orthokeratology is limited to myopia within 500 degrees, and its function is not optimistic for myopia above 500 degrees. In addition, its price is relatively expensive. If it is 1-2 years, it needs to be replaced 1 time, which will cause a certain burden to wage earners and ordinary families.