Myopia surgery requires corneal examination, refraction examination and comprehensive optometry examination, corneal topography examination and fundus examination. 1. Corneal examination: Myopia surgery begins with an examination of the cornea to see if the corneal endothelium has severe endothelial dystrophy. It is also necessary to check whether the thickness of the cornea is sufficient. 2. Refraction examination and comprehensive optometry examination: This is the more important examination. Determine the refractive error of the eye is essential for myopia surgery; comprehensive optometry is mainly to adjust the specific eye degrees, such as 300 degrees myopia, combined with 150 degrees astigmatism, and then add how many axes aligned to play the laser. 3. Corneal topography examination: the main purpose is to check the shape of the cornea, if it is a conical cornea, it will not be able to perform myopic surgery. 4. Fundus examination: Do fundus examination to check whether there is any hole in the peripheral area of the eye, the fundus of the eye of people with high myopia is prone to holes, and if there is a hole, the laser needs to be opened in advance to seal it. If you suffer from cold, fever or other physical discomfort before the surgery, please inform the doctor so that the surgery can be arranged reasonably.