Excimer laser in situ keratomileusis (Lasik) is an advanced laser procedure based on PRK, in which a microkeratome is used to create a tipped flap of 130-160um thickness on the cornea, and then the excimer laser is used to ablate the exposed superficial corneal stroma, and then the flap is repositioned to complete the procedure. The treatment is completed by resetting the flap. The patient has no significant postoperative pain, sore eyes, tearing, and foreign body sensation for several hours. After the surgery, the vision recovers quickly, and the vision improves significantly on the second day after the surgery. Postoperative eye medication is only needed for half a month to one month.