Laser surgery is a corneal laser correction surgery for myopia, mainly through laser cutting the cornea to flatten the corneal curvature, which can correct myopia and improve vision. Generally speaking, the laser correction surgery on the market at present is mainly divided into three categories, namely full femtosecond surgery, semi-femtosecond surgery and surface surgery. All-femtosecond surgery is to use femtosecond laser to make a lens on the corneal surface and take it out through a small incision, which can play a corrective role. Semi-femtosecond surgery is to use femtosecond laser as flap, and then use excimer laser to cut cornea, thus correcting myopia. Surface surgery is to use excimer laser to cut the cornea and make it thinner, so as to correct myopia and improve vision.