Any surgical procedure that ablates tissue at the surface of the cornea, rather than under a Lasik or All-Laser Lasik stromal flap. PRK, LASEK, and Epi-Lasik are all surface ablation techniques. Several studies have shown that surface ablation techniques provide better refractive surgery outcomes than Lasik or All-Laser Lasik, for patients who are appropriate candidates for both types of surgery. T