Myopia is mainly caused by a failure to use the eyes in a healthy way, but in some people it is caused by genetic or environmental problems. Acquired myopia can be treated with myopia surgery. Patients under the age of 18 are still developing, their eyes may become longer and their myopia is unstable, so if they have surgery during this time, they may have poor post-operative stability and refractive regression, resulting in poor correction. Myopia surgery is also generally not recommended for people aged >45 years old, because after the age of 45 years old, presbyopia symptoms may be combined with weakened adjustment power. If myopia surgery is performed at this stage, it may lead to aggravation of presbyopia symptoms. The number of degrees applicable: according to the different methods of myopia surgery, the number of degrees is also differentiated, if the change of myopia and astigmatism within a year does not exceed 50 degrees, generally 300-2000 degrees of myopia can choose the appropriate surgical method under the guidance of doctors. 1, full femtosecond laser surgery: full femtosecond laser surgery through the femtosecond laser in the corneal layer of two cuts to form a lens, from the micro-incision to remove the lens, thus The lens is removed from the micro-incision, thus completing the correction of myopia, which can usually correct myopia below 800 degrees; 2. Semi-femtosecond laser surgery: There are certain requirements for corneal thickness, and semi-femtosecond laser surgery first uses a femtosecond laser to create a corneal flap, and then uses an excimer laser to cut the corneal stroma, thus changing the curvature of the cornea and enabling light to focus on the retina, thus achieving the purpose of correcting myopia, which can usually treat Patients with less than 1000 degrees of myopia; 3. IOL implantation: people who are not suitable for laser surgery to correct myopia (more than 1000 degrees) can choose IOL implantation to correct myopia, which can usually correct less than 2000 degrees of myopia. In addition to the applicable age and degree, attention should be paid to the presence of recent eye disease or the presence of systemic disease, and the need to actively follow medical advice in selecting a treatment method.