When it comes to myopia, we are all too familiar with it. How many students sitting in the classroom are not myopic? With the gradual aggravation of academic pressure, the incidence of myopia is also increasing year by year. According to a study, the myopia rate of primary school students in a certain city is 26.9%, junior high school students is 53.4%, and senior high school students reaches 72.8%, which affects the further education, employment, and military service, so it has become the biggest wish of many myopic patients to take off their glasses and get rid of myopia. Myopia treatment surgery has been around since a long time ago. The RK surgery, first invented by a Russian doctor, was popular for a while, but it was gradually phased out because it required 8-12 wounds to be made on the cornea, which had a great impact on the firmness of the corneal tissues. It is only since the emergence of the excimer laser in the 1990s, a landmark technology in the history of myopia treatment, that myopia treatment has begun to step into an era of take-off. Many people think that myopia laser surgery is still a kind of surgery, and there will be risks, especially when you search on the Internet, you will find that there are a lot of comments on the excimer laser are negative, and some people even say that this surgery will lead to blindness, so what is the truth in the end? Is excimer laser an angel or a devil? To answer this question, first of all look at the principle of excimer laser surgery. In fact, it is very simple to say, many fashionable young people like to wear contact lenses, to put it plainly, excimer laser is to change the curvature of the corneal surface through laser cutting, that is to say, change the shape of the cornea, which is equivalent to the contact lenses directly on the cornea to change the original refractive state. So in such a surgical process, the cornea in the end what kind of changes? To put it bluntly, the laser thins the cornea. Some people may ask, “If the cornea is thinned, won’t the strength of the eye be weakened? The human cornea is a layer of elastic, fibrous tissue. The central thickness of a normal human cornea is about 550 microns, or 0.5 millimeters, and many studies have shown that as long as the cornea thickness is maintained at 250 microns or more, it is sufficient to resist the effects of intraocular pressure on the wall of the eye. Therefore, even if 1/3 or even 1/2 of a normal person’s cornea is removed, the remaining corneal tissue still provides safe protection to the eye. Just like some people can donate part of their liver and one of their kidneys in order to save others, but they can still live a normal life themselves because the organs of the human body have enough functional reserve. Some people may ask whether there will be rebound after having myopic surgery. The adaptable people of excimer laser surgery are adults who have reached the age of 18. Generally speaking, the development of eyeballs of adults over 18 years old has stopped, that is to say, myopia has been stabilized, of course, we should exclude a kind of disease known as pathological myopia, which will lead to lifelong deepening of myopia of the patients; excimer laser is only correcting the current myopia of the patients through the cutting of the cornea, so as long as the patients pay attention to the maintenance to maintain their own myopia not to deepen, most of the people will not rebound after the myopia surgery. Therefore, as long as the patient pays attention to maintenance, to keep their own degree of no deepening, most people will not rebound after myopia surgery. Unless the patients still do not pay attention to eye hygiene after the operation, long time near eye fatigue caused by visual fatigue, myopia will still deepen, thus causing a certain rebound. After more than 20 years of development, excimer technology has tended to be a very mature technology. Since the surgery is performed on a healthy eye, the preoperative examination is very careful and strict, and a full assessment of the patient’s eyes is required to ensure that the surgery can achieve satisfactory results. Some patients cannot undergo the surgery due to certain reasons, such as the cornea itself is too thin, the corneal curvature is too high, the myopia is too deep, combined with retinal diseases, etc. Many of the serious cases circulating on the Internet, even leading to blindness, were caused by the lack of knowledge of excimer surgery in the early stage of the development of excimer surgery, and the surgery was performed on patients who should not have been operated on. Therefore, as long as you strictly grasp the indications for surgery, the risks of excimer laser surgery can be completely controlled. Here, some questions about excimer laser surgery that we are more concerned about are briefly explained. Dear readers, is excimer laser surgery an angel or a devil? I believe you have the answer now.