Excimer laser treatment for myopia was first used in clinical practice by American doctors in 1985 and has developed rapidly in recent years, and was introduced to China in the early 1990s. The surgical results of excimer laser treatment for high, medium and low myopia are far superior to those of previous refractive surgery, and therefore, it has been widely noticed by ophthalmologists all over the world. However, many people still have doubts about its safety, fearing that their eyes will go blind in the future. Excimer laser is an ultraviolet light produced by the excitation of fluorine-argon gas mixture, which is a cold laser that can precisely ablate the part of the human cornea that is expected to be removed without damaging the surrounding tissue and other tissues. Its wavelength is very short and it has a photochemical rather than a thermal effect on biological tissues, therefore, no thermal damage is produced. In addition, the excimer laser has a short wavelength, weak penetration, and each pulse can only cut 0.25um in depth. It is a horizontal cut under the cell, and the cut is extremely precise, so there is no damage to the internal structures of the eye. Currently, excimer lasers are equipped with infrared or radar eye tracking system, when your eye deflects beyond the normal range, the laser will automatically stop cutting to ensure the safety and accuracy of the treatment. Excimer laser treatment for myopia is based on the principle that myopia is caused by the anterior and posterior diameters of the eye being too long or the front surface of the eye being too convex for external light to converge accurately on the retina at the base of the eye. Excimer laser keratomileusis (LASEK, LASIK, etc.) uses a precisely computer-controlled excimer laser beam to cut the anterior surface of the cornea to flatten it slightly so that external light rays can accurately converge on the retina for the purpose of correcting myopia. Looking at the excimer laser itself: cold laser, very low penetration and the surgical site for myopia correction: the anterior surface of the cornea, which does not enter the eye, greatly reducing the risk of intraocular infection! But any surgery is risky even if the chance of occurrence is very low, it should be taken seriously! The risks of surgery should be fully considered, and not be taken lightly by advertisements! Be sure to go to a regular eye hospital for a detailed pre-operative examination before surgery, as this will greatly reduce the risk of surgery, and allow your doctor to analyze the results through a detailed examination to determine the best surgical plan for you! In addition, many people who are excited to remove their glasses remember: every six months to a year regular dilated eye examinations at regular eye hospitals (this has nothing to do with excimer laser surgery, but with your myopia, because the anterior and posterior diameters of myopic eyes become longer, the chance of retinal degeneration, broken holes and retinal net detachment is more than 6 times higher than in normal eyes.)