Excimer laser treatment for myopia, hyperopia and astigmatism is a well-established method of treating refractive errors. However, a good laser refractive surgery not only requires the surgeon to have a rich theoretical foundation, skillful surgical techniques and follow certain surgical standards. This is the only way to ensure a high quality surgical result. The following is a brief introduction to the relevant content: a. Pre-operative examination. This includes the basic examination of the eyes, including the examination of the retina after pupil dilatation cannot be ignored. Many patients with low myopia often also have retinal degeneration or even dry holes, which can be treated with preventive retinal photocoagulation in advance. This is the only way to rule out pseudomyopia and obtain a more realistic refractive condition. The exclusion of potential cone corneas before refractive surgery is also very important, and can only be truly checked by the Orbscan and the Pentcam, Sirius, such as the anterior segment analysis system, only the ordinary corneal topography examination is not enough. Second, surgery. The current surgery can be divided into two types of excimer superficial cutting and intra-stromal cutting according to the anatomical level. 1, superficial cutting including traditional PRK and LASEK, EPI-LASIK. the basic principle has not changed, that is, cutting under the epithelium, clinical experience has proved that the role of the so-called corneal epithelial flap is extremely limited, at present, the addition of 0, 2mg/ml mitomycin in foreign countries is very important and necessary. It can be very effective in reducing the occurrence of postoperative subepithelial haze clouding. 2, Intra-stromal cutting includes LASIK, SBK and femtosecond LASIK. Simply put, a corneal flap with a tip is made, including the epithelial layer and the superficial stromal layer. The flap is then cut within the stroma. Currently, the flap can be made using a mechanical keratome or a femtosecond laser. The femtosecond laser produces a more uniform flap than the mechanical knife. In terms of safety, there is not much difference between the two methods. For the mechanical keratome, one blade per patient is required to ensure safety and postoperative results. Some low-cost competing units or certain doctors will reuse blades. In principle, this is not allowed. Excimer laser cutting includes both conventional and individualized treatments. Individualized treatment in turn includes wavefront aberration guidance, aspheric cutting and other modalities. The faster the surgery, the less harassment to the patient’s eye, which places high demands on the machine hardware. The latest generation of excimer laser and femtosecond laser can meet this requirement. Third, post-operative care. For superficial cutting procedures, despite the prophylactic application of mitomycin during surgery, weak hormonal eye drops such as flumetone should be routinely ordered for three months after surgery to prevent the occurrence of subepithelial clouding of the cornea. Hormones can cause hormonal glaucoma, so be sure to check IOP regularly. Also if the IOP is high, do not continue to apply hormonal eye drops while lowering the IOP, as this will mask the symptoms and worsen the glaucoma. Early discontinuation of hormones in hormonal glaucoma can restore IOP to normal. The postoperative care for stromal cutting is relatively simple, and the main problem is to prevent eye injury, causing displacement of the corneal flap. Fourth, equipment and hospital conditions. Domestic medical departments for such projects negligent management, the hospital with a mixed bag of equipment, more than ten years ago the old equipment is still applied. So you can learn more about the equipment on the Internet and choose a regular hospital. In conclusion, excimer laser is a very safe procedure for both superficial cutting and intra-stromal cutting, and the results are sure. You can choose the procedure according to your economic conditions and specific needs.