LASIK is a highly accurate procedure, with over 28 million procedures performed worldwide. So while the LASIK procedure is highly accurate, what prevents a guarantee of 20/20 vision is your individual healing. The human cornea is living tissue, and if your healing response is a little more or a little less than expected, there is a slight chance you’ll need a touch-up procedure, called an enhancement. Following your doctor’s directions and drop regimen will help you to have a great outcome.