Indications: 1. The patient himself/herself has the requirement of lens removal. (1) Unsuitable for wearing frame glasses and contact lenses. (2) The surgery is necessary due to some eye disease. (3) Occupational requirements can not wear frame glasses and is not suitable for contact lenses. (4) Requirements based on cosmetic reasons. (5) Required to join the military and participate in special occupations. (6) Hobby sports and often participate in intense activities, such as field work, should not wear glasses. 2.Age above 18 years old. 3. Stable refractive error in the past two years. Corrected refractive range: myopia should be no more than -15,00DS, astigmatism should be no more than 6,00DS, and hyperopia should be no more than +6,00DS. 5. Refractive Parallax. Unequal vision between the two eyes will result in visual imbalance, causing poor vision and affecting daily life. 6. For those who are wearing corneal contact lenses: soft lenses should be stopped for more than 1 week, hard lenses should be stopped for more than 3 weeks, and OK lenses should be stopped for more than 1~3 months. 7, Corneal thickness is more than 450um. 8, There is no active disease in the eye. 9, those who need to operate again: LASIK interval of more than 6 months, PRK interval of more than 1 year. Who is not suitable for excimer laser corneal refractive surgery? Contraindications: 1, active inflammation of the eye such as acute conjunctivitis, keratitis, dacryocystitis, etc.. 2.Patients with cone cornea, glaucoma, dry eye and other diseases. 3.Patients who have had fundus hemorrhage and retinal detachment. 4.Patients with diabetes, keloid, collagen disease and other diseases that affect the healing of corneal wounds. 5.Patients with severe amblyopia. 6, Drivers with high myopia who often drive at night. 7.People who have very high requirements for eyesight and are extremely concerned about their eyesight. 8, Psychiatric patients. 9, Central corneal thickness less than 450μm.