Photo-Refractive Keratectomy became popular worldwide in the early 1990's when the excimer laser was first approved by the FDA for laser vision correction. During PRK surgery the corneal surface is treated instead of the inner tissue as in LASIK. The results are similar to LASIK, but the healing process is slower and there is more discomfort for the first few days post operatively. Many patients who have pre existing problems such as corneal cell problems, severe dry eye, thin corneas or occupations that require PRK have excellent outcomes with PRK.