Epi-LASIK – Advanced Surface Ablation Prior to treatment, the outer protective layer of the cornea, known as epithelium, is removed. Then, using the excimer laser, a precise amount of tissue is removed to correct your specific refractive error. The entire procedure usually takes only a few minutes. After receiving post-operative instructions you will be discharged and instructed to return to see Dr. Kansas the next day and for several other follow-up visits. This newest version of laser correction is considered safer since it eliminates cornea cutting.