Chen, 27, usually wears 600-degree contact lenses, and his eyes are prone to dryness and discomfort. In order to get rid of the glasses, he came to the eye hospital to do laser myopia surgery. I didn’t expect that the surgery would be completed in just ten minutes. The next day’s follow-up, the vision of both eyes is 1.2, Chen is very happy. In fact, laser myopia surgery can not be done by anyone, there are strict requirements, specifically the following aspects: 1, age: In general, all types of refractive surgery are mainly for adults, the age of 18-50 years old. However, specific to different surgical methods and different eye conditions, the age requirements are also different. 2. Refractive stability: In general, it is best to have a relatively stable refractive error within the past two years before undergoing refractive surgery. Generally consider a change of 100 degrees or less as stable. Of course, this requirement is not absolute. This is because, in many cases, it is really difficult to determine whether the refractive error is stable or not. Mild to moderate myopia is easier to judge. Patients with high myopia, usually with glasses may not be sufficiently corrected, so the results of the optometry will be higher than the previous glasses, and can not be judged as the degree of instability. 3, mental health: First, it should be recognized that refractive surgery is nothing more than an optical correction instead of glasses, and it is impossible to achieve vision beyond normal. However, for people with poor psychological health, they may be worried because of some changes in visual quality or because of problems such as dry eye. 4, eye examinations meet the conditions for surgery: these examination results include: corneal thickness, corneal topography, intraocular pressure, cornea, fundus, etc. There are also wavefront aberration, contrast sensitivity, and ocular AB ultrasound to fully assess the condition of the eye, to determine whether it is suitable for surgery on the one hand, and to select the most suitable surgical procedure on the other. 5, physical health: For some systemic diseases that may affect corneal healing, such as systemic connective tissue diseases, immune diseases, generally cannot be considered for surgery. Diseases such as diabetes, hypertension, cardiovascular disease, etc. should be treated and within the safe range before surgery is carefully chosen.