Like LASIK Laser Vision Correction, PRK uses the laser’s cool ultraviolet light beam. Now the difference between LASIK and PRK begins. In LASIK, a microkeratome is used to gently create a corneal “flap” that is left attached and folded back prior to the laser being applied to the corneal tissue. PRK does not require the creation of a flap. Microscopic amounts of corneal tissue are removed after the eye’s epithelial layer has been removed either with an alcohol-based solution or an amoils brush. PRK may be recommended to retain the integrity of the eye, or for patients with larger pupils or thinner corneas.