Hello, I was wondering if somebody can explain the purpose of steroid drops (such as Flarex) after PRK surgery, and why the duration for the prescribed usage of the drops is directly proportional to the magnitude of the pre-surgery prescription. I had -7.5 in the left eye, and I have to use Flarex for almost six months. My right eye was -6.5, and there I have to use the drops for about three months. Just wondering. Thanks, Irina Paley