just DON'T let any OSOs talk you into switching to NFO while you're waiting to get your eyes fixed to be a pilot. I did that, even though i had NO interest in being an NFO, b/c my OSO told me i had everything to gain and nothing to lose by taking the contract (i.e., i could drop it or switch to pilot whenever i wanted to). well, they're hurting for NFOs, and they wouldn't let me switch. now i'm kinda screwed.
if you're a ground guy, though, you should be able to switch to pilot. the only thing is that they're funny about granting waivers for PRK surgery performed by civilian docs (btw, LASIK is a disqualifier. don't do that.)