Hello, I am 22 years old and looking into getting PRK corrective surgery. I have gone to several well regarded surgery clinics in my local area, and in some of them they will only perform the surgery if they have vision tests 6 months apart with less than .5 diopter change in myopia or astigmatism. The other clinics will take my word for having steady vision, and do not require my vision records. I have worn glasses my entire life, and my last prescription is ~5 years old, however it is not current. (As in it does not correct me to 20/20 right now, and quite a bit worse.) I believe that my vision has been stable (just based on the distance I can see several things such as clock etc. that I see almost daily) for quite some time, however with this you can never be sure. What would happen if I had the surgery and my eyes were still changing? Would the myopia/astigmatism simply return? (Is that the reason for the touch up surgeries?) I would like to get the surgery ASAP, however would like any advice etc. on people who have had the surgery while their eyes are still changing or what the risks are.