Excimer laser is a kind of ultraviolet light beam with a wavelength of only 193 nanometers, which is invisible to the human eye, and its characteristics are high photon energy, extremely short wavelength, and extremely weak penetration to tissues. This changes the shape of the corneal surface and adjusts the refractive power of the cornea so that external light can accurately converge in the eye to correct myopia. There are more and more methods to correct myopia, and excimer laser surgery is now recognized as a safe and effective way to solve myopia once and for all. The procedure is characterized by a high success rate, low risk, short surgery time, painless intraoperative period, easy postoperative care, and most patients can achieve optimal vision the day after surgery. Generally, only patients who meet the following conditions can be considered for excimer laser surgery: 18 years of age or older, have a healthy mental state, have a desire to remove glasses due to military or occupational needs; no active eye disease; myopia has been relatively stable for the last two years, with an annual increase of no more than 50 degrees; if wearing contact lenses, soft lenses should be removed for 2 weeks and hard lenses should be removed for more than 4 weeks (they can be replaced with frames If you are wearing contact lenses, you should remove your soft lenses for 2 weeks and your hard lenses for more than 4 weeks (you can replace them with frames) before you can have the surgery. People with the following conditions are not suitable for excimer laser surgery: acute or active inflammation of the eye, dry eye, incomplete eyelid closure, glaucoma, cataract, uveitis, retinal detachment, ischemic eye disease, viral eye diseases such as herpes simplex, and the following systemic diseases: diabetes, collagen diseases (lupus erythematosus, etc.), rheumatoid arthritis, gout, psychiatric medication, AIDS, certain diseases Those who have certain diseases that affect wound healing or those who are eligible for surgery but have concerns or high expectations, as well as pregnant and lactating women.