First, keratomileusis is designed for patients with “cone keratopathy” myopia and other myopic patients with specific corneal diseases. If an experienced ophthalmologist takes a look at this statement, there is a problem. It is clear that the author has confused keratoconus with RGP. Although both are rigid corneal contact lenses, they are used for completely different targets. The RGP is mainly used for patients with high myopia and cone corneas above 600 degrees. It is obvious that the posting is about RGP, not keratoconus. Second, the U.S. FDA and China’s State Drug Administration have stipulated that keratomileusis is a Class III medical device. The third category of medical devices is the most dangerous medical device. How can such a medical device (keratomileusis) with the highest level of risk be used for general myopia in children and teenagers? 1. First of all, the author also acknowledges that the keratoplasty lens is certified by the FDA and the State Drug Administration of China, so its legality is recognized. You can go to the website of the State Food and Drug Administration and search for “keratoplasty” in medical devices, there is the scope of application of the relevant products, clearly showing the role of myopia correction. 2, why it is categorized into the scope of the third class medical devices, is because the state requirements for this technology is relatively strict, not any institution can do, it belongs to a strict medical practice, must take the third class medical device qualification certificate and follow the relevant national regulations in the qualified optometric professional dispensing institutions. 3, corneal shaping lens for the population and no age limit, the main test rate to the child’s own hands-on ability, the general requirement is 8-40 years old. Third, not careful, keratoplasty will make the cornea inflammation, perforation, eye blindness. In response to this problem, and is one of the most concerned about all parents. Our country introduced the technology in 1998, and now millions of people have received this treatment. In the initial 2-3 years, due to the lack of medical management and standardized operation, hospitals that carry out this technology do not know enough about keratoplasty for myopia, and have very limited experience and technology in fitting, poor consumer compliance, exaggerated propaganda and misinformation from media advertisements and product promoters, some companies and optical stores that are not qualified have also carried out, and sold keratoplasty lenses as ordinary commodities, forming a The quality of keratoplasty lenses has not been strictly monitored by the relevant authorities, which has led to some serious malpractices among Chinese wearers in the first few years, and has attracted close attention from domestic and international media. Of course, this problem has a lot to do with the improper handling of patients and the lack of regular review. Therefore, many of the adverse reactions to keratomileusis that are now being reported on the Internet are from that stage rather than the current stage. Now that the latest generation of keratoplasty lenses has reached its fourth generation, there are very few reports in the media about serious adverse reactions to the use of keratoplasty lenses. Qualified optometrists strictly fitting + qualified lenses + qualified users (patients) = safe and effective. Fourth, “deprivation of oxygen”. Generally 1-2 years “dry eye” formation. The state currently requires that the DK value (oxygen permeability) of the lenses for night wear should be above 90, while the oxygen permeability of corneal plastic lenses is now above 100, or even 140. The formation of dry eye is related to one’s own constitution and eye habits, and is not entirely formed after wearing plastic lenses. At the beginning of the fitting process, children are usually checked for dry eyes, and if they have severe dry eyes, they are not suitable for fitting. Most of our myopic teenagers have symptoms of dry eyes and conjunctivitis, but we don’t know these problems because we didn’t do regular checkups before the prescription, and after the lenses are worn, the doctor may mention the symptoms of dry eyes, so many parents think it is caused by wearing the lenses. In fact, it is not true. In addition, parents look at their children’s usual amount of eye use, especially in middle school and high school children, almost no rest time, either in school classes, or at home to do homework, or in cram school, sleep time is seriously inadequate, the phenomenon of visual fatigue is very serious, which will invariably increase the burden on the eye, resulting in the occurrence of some eye disease. Fifth, corneal central thinning Corneal central thinning is one of the main causes of “cone keratoconus” (commonly known as “proptosis”). Our normal central corneal thickness is about 0.565mm, after 7 years of overnight wearing patients, we found that the central cornea is mildly thinned by 0.009mm after wearing, but the difference is not statistically significant. In addition, at the beginning of the fitting, the patient’s corneal thickness will be checked, such as a cone cornea is not suitable for fitting. Sixth, the corneal curvature deformation (corneal center thinning peripheral relatively high). General ophthalmologists know that our cornea is somewhat elastic, in the early stage of lens wearing, due to the pressure of the central corneal tissue transfer to the periphery, epithelial cell thickness thinning, width increased, so as to achieve the effect of improving naked eye vision, but the number of corneal epithelial cells is unchanged, the volume and area is constant. The corneal parameters examined after wearing the lens are definitely different from those before wearing the lens. The cornea is reversible, and the shape of the cornea generally returns to its original shape after about one month of discontinuation, rather than the corneal distortion described by the authors.