It was also my understanding that you couldn't have PRK after getting a pro-rec, unless you got the ok from the chain of command (your recruiter, his superiors, etc.) Again, just talking from personal experience....
If my eyesight was as good as my hindsight, I wouldn't need the procedure.
The very first day I walked into my recruiter's office to find out about becoming a Naval Aviator, the first thing I told him was that I could not pay for the surgery unless I was already accepted into the program. He agreed that it was up to me and we could do MEPS after pro rec.
I should have done it before, but not knowing if spending the money was going to benefit me I was not ready to cross that bridge. However, now I realize that I have to wait 3-6 months to sign my life away and start getting paid. It sucks but that's the way it is.