Photorefractive Keratectomy (PRK), like LASIK, is a form of laser refractive surgery that reshapes the cornea. PRK is a great option for those who are not LASIK candidates due to thin but otherwise normal corneas. The primary difference between LASIK and PRK is that in PRK, there is no corneal flap created – instead, a thin layer of surface (epithelial) cells are removed. Then, the laser ablation is performed. PRK has a longer recovery period than LASIK; but the three month outcomes are very similar.