1.TransPRK: The principle is to apply excimer laser to cut the epithelial layer, the anterior elastic layer and the superficial stromal layer of the cornea, and the curvature of the cornea is reduced after cutting, and the refractive power of the cornea is reduced, thus correcting myopia. The advantages are: less damage to corneal biomechanics, high safety, especially suitable for young people who love outdoor sports, have the need for confrontational sports and work nature, such as conscripts, police officers, athletes, etc. LASEK and epi-LASIK: The principle is to create an epithelial flap and then apply excimer laser to cut the anterior elastic layer and superficial stromal layer of the cornea, which reduces the curvature of the cornea and the refractive power of the cornea, thus correcting myopia. Young people who love outdoor sports, have the need for confrontational sports and work nature. LASIK is more in line with the anatomical and physiological characteristics of the human cornea and can be used to correct myopia from 100 degrees to 1500 degrees, with the advantages of fast vision recovery and short hormonal medication time. . 4, SBK: is a new type of LASIK surgery, that is, the anterior elastic layer under the laser corneal abrasion, the production of corneal flap depth is located between the anterior elastic layer of the cornea and the corneal stroma, SBK surgery to produce a corneal flap is usually about 95 microns, than other types of LASIK surgery flap is much thinner, will make the corneal structure better stability, post-surgery corneal biomechanical changes are less, the risk of The risk of corneal bulge will be smaller. 5, femtosecond laser surgery: the production of corneal flap with femtosecond laser, the accuracy of control within 10-15 microns, its accuracy is tens of times that of laminar knife, femtosecond laser production of corneal flap and corneal bed is embedded occlusion, reset easily, occlusion tight, will not be misaligned. The corneal flap is much thinner than the flap made by ordinary LASIK, which will make the corneal structure more stable and the corneal biomechanics more stable after surgery. 6.Femtosecond laser: During the treatment process, a femtosecond laser system is used to cut a thin layer of corneal tissue in the shape of a convex lens at a relatively deep level of the cornea, and special forceps are used to remove the corneal tissue that needs to be eliminated for myopia treatment, called “femtosecond laser corneal stromal lens removal”. The procedure is truly minimally invasive, ensuring a “no incision” state and a more stable corneal biomechanics after surgery.