Keratoplasty lenses, also known as OK lenses, are highly oxygen permeable rigid corneal contact lenses that need to be worn at night half an hour before bedtime and removed when you wake up in the morning. Daytime vision can be up to 1.0 without the need to wear frames. Keratoconus can slow the progression of myopia in young people. But it does not stop the progression of myopia. The average annual myopia control averages 0.3 D’s, which is usually what we call 30 diopters. Recent world studies have reported that the myopia control rate can be as high as 60%, which means that if a child develops 100 diopters of myopia per year, then 40 diopters will develop in one year after wearing keratoplasty lenses. That means if a child develops 100 myopia per year, then 40 myopia will develop in one year after wearing keratoplasty lenses. Parents of children often ask us in the hospital with concern: Is keratoplasty safe? Isn’t it said that keratoplasty can cause corneal ulcers and make children blind? Have some people even had their eyes removed? These are not just empty claims. To understand why these happen, one must start with the history of keratoplasty. There have been four generations of keratoplasty lenses since they were made in 1963. The third generation of OK lenses began to be popularized in our country, that is, OK lenses began to be used in optical stores around 2000, but the corneal oxygen permeability of the third generation of OK lenses was not high, with an oxygen permeability coefficient of only 38, which could only be worn during the daytime according to the theory. However, due to the fact that the country did not know enough about OK lenses and the supervision was not strict, this kind of contact lenses were dispensed in the optical stores and were not reviewed after wearing them, which led to the tragedy of some patients wearing them for a long period of time in the evening without paying attention to the cleaning of the lenses. The OK lenses we are talking about now are the fourth generation of keratoplasty lenses with a more rational design. The oxygen transmission coefficient of the cornea reaches 100 or even more than 100, which is in line with the standard for night wear of keratoplasty lenses (the oxygen transmission degree must be more than 90), and it is necessary for the doctor to carry out the fitting and review. Wear them for 1 week and review them once. Then every month for 6 months and 2 months after that. Training in the techniques of wearing the lenses is very rigorous. If you wear corneal reshaping lenses be sure to follow the doctor’s instructions for review. Our hospital has experience fitting thousands of keratoplasty lenses without any of the corneal complications mentioned above. To summarize: Keratoplasty has a role in myopia control. Keratoplasty lenses are safe as long as the lenses are cleaned carefully according to the doctor’s requirements, reviewed carefully, and promptly reviewed when discomfort occurs.