1. Lie flat on the surgical bed and look at the flashing light above you (green, easily visible) and relax your whole body. 2.The eye is routinely disinfected and toweled, and the lid opener is used to hold the eyelid open (the eye is self-fixed). The PRK surgeon scrapes the corneal epithelium, which takes about ten seconds; the LASIK surgeon first attracts the eye with negative pressure (the eye feels slightly swollen at this time), and then uses a microkeratome to make a uniform corneal flap, which takes about ten seconds; the LASEK surgeon takes about twenty seconds to make a corneal epithelial flap. 4, determine the optical center of the cornea, hit the laser, about a dozen seconds to dozens of seconds (depending on the degree of myopia, you will hear a popping sound, eyes keep looking at the green light on it). 5. PRK and LASEK eyes are fitted with protective corneal contact lenses, which are removed after one week; LASIK eyes wear clear eye shields after surgery. The surgery will be performed in a painless, relaxed environment.