Laser surgery is, after all, a surgery, not what we think of laser surgery, the treatment process is very simple, the surgical procedure is very short, the damage is relatively small, but many cases can not be laser surgery: 1, generally after 18 years old, after the relative perfect development of the eye can be laser surgery; 2, within 2 years the degree of deepening can not exceed 50 degrees before laser surgery; 3, the eye is not acute infection can Laser surgery can be performed; 4. Patients whose cornea is too thin, too large, or does not match the thickness of the cornea cannot undergo laser surgery; 5. If there are fundus lesions caused by high myopia, there is a certain risk of laser surgery. Generally patients will do a lot of tests to exclude contraindications before undergoing laser surgery, not just do the surgery. People with amblyopia do not have a significant improvement in vision after laser surgery. Therefore, children with amblyopia must be treated at a young age so that the results of laser surgery will be relatively good when they grow up.