PRK or Photo-Refractive Keratectomy treats refractive errors by removing tissue from the surface of the cornea.
First, your eye is numbed using a topical or eye drop anesthesia. Then, a surgeon removes the epithelium, a thin layer of protective skin that covers the cornea. This is done with either a brush or the excimer laser. During the actual procedure, the patient stares at a fixation light. In less than a minute, the laser removes the proper amount of tissue while it reshapes the surface of the cornea.
A bandage contact lens is placed on the eye for 2-3 days. Because the ephithelium was removed, patients may experience blurry vision for three to five days. Eye drops and the contact lens are effective in reducing postoperative discomfort. Final visual results may be fully realized anywhere from several days to a few months as the surface heals in accordance to each individual’s healing tendencies. PRK is used to treat low to moderate amounts of nearsightedness, astigmatism, and farsightedness.