The excimer laser is a mixture of argon fluoride gas that is excited to produce a “cold laser” in the ultraviolet wavelength range of 193 nanometers. Excimer laser is one of the most advanced ophthalmic technologies available in the world. It is designed for patients with myopia, hyperopia and astigmatism to eliminate or reduce the degree of myopia by eliminating the use of frames or contact lenses, or to eliminate the unnecessary pain caused by the use of other unsafe treatments. Excimer laser technology is a combination of modern science and multiple disciplines such as ophthalmology and optometry, and requires very strong expertise. For example, strict and careful ophthalmological examination and evaluation of professional indexes before surgery, screening of surgical indications, accurate grasp of the surgical process, selection of surgical methods, correct use of equipment, close follow-up after surgery and timely management of complications, etc. all require experienced professionals and perfect professional technical equipment. I. Indications The patient has the need to remove glasses, and: 1, the age of 18 weeks or more; 2, the refractive error is stable in the past two years, its development rate is not greater than 0.50D per year; 3, the corrected refractive error range: myopia 1.00-12.00 degrees; farsightedness 6.00 degrees or less; astigmatism not more than 6.00 degrees; 4, the refractive error of unequal refractive error in both eyes LASIK surgery is not suitable for people with active inflammatory eye disease (such as acute conjunctivitis, blepharitis, keratitis, corneal ulcer, lacrimal sacculitis, iridocyclitis, etc.). Contraindications 1. active inflammatory diseases of the eye, including conjunctivitis, keratitis and chronic dacryocystitis; 2. severe corneal dystrophy; 3. retinal detachment and other fundus lesions; 4. dry eye, cone cornea, glaucoma, diabetes, collagen disease; 5. scarring (relative contraindication to LASIK surgery); 6. pregnant women and drivers who drive at night; 7. wearing glasses The severe amblyopia with very poor corrected visual acuity; 8, those who have very high requirements for visual acuity and have great concerns about surgery.