Photorefractive Keratoplasty (PRK) is a laser eye surgery procedure used to correct vision problems. In the PRK procedure, the doctor uses a laser to remove small amounts of tissue from the deeper layers of the cornea, permanently reshaping the cornea to correct refractive errors. The outer layer of the cornea, the epithelium, is removed, and a computer tracks the movement of the patient's eye up to 4,000 times per second, allowing for very precise direction of the laser. The epithelium regenerates quickly after surgery. Up to 80% of people with myopia may be candidates for PRK, so talk to your eye doctor to see if this procedure is the right one for you.