Myopia is mostly caused by the inability to use the eyes in a good and healthy way, and some may be caused by problems such as genetic or environmental influences, which can be corrected through surgery. The appropriate age is between 18 and 45 years old. Because patients under 18 are still developing, the eye axis may be gradually growing and the myopia may be unstable. If surgery is performed during this time, it will result in poor post-operative stability on the one hand, and refractive regression on the other, resulting in poor correction results. Patients over the age of 45 will have weakened adjustment and will suffer from a combination of presbyopia, and then myopia surgery may lead to increased presbyopia symptoms and inability to adapt to the usual distance of work or life, so surgery will do more harm than good. The surgery can be performed in the range of 100-2000 degrees, and the range of correction is different for different forms of myopia surgery. 1. Full femtosecond laser surgery: for patients with myopia below 800 degrees, full femtosecond laser surgery is a surgery done entirely with a femtosecond laser, which uses a femtosecond laser to scan twice between the corneal layers to form a lens and remove the lens through a micro-incision. The procedure is performed with a femtosecond laser to form a lens by scanning twice between the corneal layers and removing the lens through a micro-incision to correct myopia; 2. Semi-femtosecond surgery: If the corneal thickness is sufficient, it is suitable for patients with less than 1000 degrees of myopia. If the corneal thickness is not enough, it cannot be corrected by laser surgery, so it needs to be corrected by IOL implantation, which can correct myopia of 200-2000 degrees. IOL is an artificial lens placed between the iris and the natural lens as a refractive supplement to correct myopia.