PRK stands for Photorefractive Keratectomy. PRK is a corrective method for refractive errors just as LASIK. Unlike still commonly used Lasik technique, no flaps are created, instead, the laser starts directly from the outer layer in PRK method.
PRK operation is the procedure of applying of Excimer laser to underlying bed tissue by peeling the thin living tissue on uppermost layer of cornea called epithelium. After the operation, transparent and unnumbered contact lenses are worn for the surface of cornea to heal more easily and for protection purposes. Achieving a better vision in PRK takes longer compared to LASIK, which may take about 3-4 weeks. The first 2-4 days following the operation are generally painful and uncomfortable; it is because this is healing period of epithelium.