Objectively speaking, the current excimer laser surgery is relatively safe. Compared with the earliest radial keratotomy with diamond knife to treat myopia, its safety has made a qualitative leap, which has been fully proved by a large number of clinical practices in 10 years. It can be said that laser surgery for myopia has been relatively mature in China. However, the success rate of any operation cannot be 100%. Just as contact lenses are easy to be infected and harmful to vision, trauma caused by broken lenses of frame glasses is also one of the causes of blindness. According to the article in American Journal of Ophthalmology, the failure rate of this kind of ophthalmic surgery is110, and most domestic refractive surgery experts hold different opinions. Of course, good surgical equipment, skilled operation and rich experience of operators and good cooperation of patients are the basis of high safety of surgery.
Any operation is risky, and myopia laser surgery can't completely avoid complications. The most common complication is overcorrection or undercorrection, which should be observed for a certain period of time and re-operated as appropriate; Some people may have glare, that is, a light spot is regarded as a light cluster or halo at night, and there is a slight edema reaction between corneal tissues after operation or a large pupil at night, and its edge is close to the surgical edge, which can be gradually reduced. Keratoconus appears in people who have this potential or whose cornea is too thin after operation; Because of poor gaze on the target, eccentric cutting may occur, or the central island may appear due to the action of water vapor vortex on the corneal surface; After PRK and LASEK surgery, corneal Haze and hormonal ocular hypertension may occur due to long-term use of anti-Haze drugs. LASIK has complications related to corneal flap, such as foreign body under the flap, corneal flap displacement and dissolution, increased astigmatism, dry eye and so on. The most serious is the infection of corneal wound during operation. Although it rarely happens, it is the direct cause of blindness, so strict surgical disinfection system and good hygiene habits of patients are very important. After operation, you should also check your eyes regularly, paying special attention to the changes in macular area and peripheral retina, so as to plan ahead.