This stands for “photorefractive keratectomy” and is a laser procedure similar to LASIK used to correct refractive problems like nearsightedness. Like LASIK, an excimer laser is used to sculpt and resurface the shape of the cornea. With LASIK, however, a partial thickness flap is created and flipped up before applying the laser treatment. This flap is then laid back into place and results in more comfort and quicker healing time. With PRK, however, there is no flap and the laser ablation is performed on the surface of the cornea itself. This results in a large corneal abrasion, with more discomfort and a slower healing time than LASIK. PRK is a good option for people with thinner corneas who are not good candidates for the more popular LASIK procedure.