LASIK surgery for myopia has a good safety and effectiveness, but not all myopic patients are suitable for this surgery. The procedure also has certain contraindications to surgery: 1, corrected visual acuity: patients with severe amblyopia with very poor best corrected visual acuity. 2. Central corneal thickness: less than 450mm. 3. Patients with active inflammatory lesions in the eye: such as acute conjunctivitis, facial rimitis, keratitis, corneal ulcers, dacryocystitis and iridocyclitis. 4.Persons with ophthalmic diseases such as cone cornea, glaucoma, rabbit eye, corneal endothelial degeneration, severe dry eye and severe ocular appendage lesions. 5.Persons who have had fundus hemorrhage and retinal detachment. 6.People with ultra-high myopia and large pupils and thin corneas. 7, suffering from diseases that affect corneal wound healing: such as keloid, diabetes, collagen disease, etc. 8, drivers who drive at night all year round. 9, pregnant and lactating women. 10, meet the indications for surgery, but there are concerns in the mind, or too high expectations for surgery. 11.People suffering from anxiety disorders, depression and other mental illnesses. It is worth mentioning that not all of the above listed contraindications are absolute contraindications. Some cases can be operated with caution under appropriate treatment and close observation, but they should be implemented only after weighing the pros and cons by both the doctor and the patient.