Suitable people Not everyone with refractive errors such as myopia, hyperopia, astigmatism, etc. is suitable for refractive surgery, and only patients who have the following three conditions are suitable for treatment: 1, over 18 years of age, have a healthy mental state, and have the desire to remove glasses (a small number of patients with special requirements can be operated in advance at the discretion of the patient). 2, myopia is stabilized for two years, i.e., the increase in myopia is no more than 50 degrees per year. 3, no contraindications to LASIK after examination, such as: active inflammation of the eye, acute conjunctivitis, keratitis, etc.; suffering from cone cornea, glaucoma, severe dry eye, etc.; severe amblyopia patients with very poor corrected vision; keloid, diabetes mellitus, collagenous disorders; synophthalmos, eyelid closure insufficiency; very high demand for visual acuity, but also a great deal of concern about surgical ideology; one-eyed patients, and so on. Risks of treatment This technology uses the most advanced equipment in the field in the world at present, and the whole process of laser treatment is controlled by computer, and it has an automatic tracking system of eyeballs, which makes the treatment reach the perfect realm of high safety and precision, so serious sequelae have not been found so far. As the wavelength of this excimer laser is very short, 193 millimeters, it cannot penetrate into the eye, so there is no reason for the sequelae to appear several years after the treatment. Surgery time The time taken is very short, about ten minutes; it takes only a few tens of seconds to hit the laser. The main process is to make a corneal flap with the femtosecond laser, then use the laser to polish the base layer under it, and finally reset the flap, and the surgery is completed.