The basic principle of laser treatment of myopia is to change the curvature of cornea through laser surgery, so as to achieve the purpose of correcting vision. The purpose of this treatment is to improve the patient's vision through surgery, not to cause blindness or long-term complications.
However, any operation has certain risks and complications. There may be some short-term discomfort and complications, such as dry eye and corneal infection, during laser surgery for myopia. The probability of these complications is very low, but they need timely treatment and management.
As for the so-called "myopia will be blind after 20 years of laser treatment", this is a rumor lacking scientific basis. In fact, after laser surgery for myopia, the patient's vision has been improved. Long-term observation results show that surgery has no negative impact on the long-term health of eyes.
Of course, myopia laser surgery is a high-risk operation, which needs to be strictly controlled and carried out in medical institutions with corresponding conditions. In the United States, myopia laser surgery has been approved by FDA and carried out in most ophthalmic medical institutions. However, like all operations, laser surgery for myopia requires strict control of indications and contraindications, and adequate preoperative examination and postoperative management.
Generally speaking, laser treatment of myopia is a safe and effective treatment method, which has been widely used and recognized. Although there are some risks and complications in the operation, as long as it is carried out in a medical institution with corresponding conditions and treated and managed under the guidance of a doctor, the risks and complications can be minimized. Therefore, the so-called "the United States prohibits laser treatment of myopia because it will be blind after 20 years" is a rumor without scientific basis.