I'm pretty sure PRK and LASIK are both approved....but check that website and talk to a Flight Surgeon before you do anything.
BTW, when I took my physical (2005) 20/200 was the max waiverable limit, as long as everything else checks out OK. If I remember correctly you could have up to 20/70 uncorrected as long as it was correctable to 20/20, and not need a waiver. From 20/70 to 20/200 as long as everything else checked out you could get a waiver. There is also something in there about refractive error, I believe it was -1.50 to +2.00 w/o a waiver and -3.00 to +3.00 required a waiver.
Just something to think about before you let someone put a laser to your eye!
Goodluck, feel free to PM with any questions.