PRK vision corection is OK for entry into Diving Duty in the Navy, and therefore OK for DMOs. You can get in prvately and as long as it is not botched, no problem. LASIK is a disqualifier for diving duty due to the flap issues already mentioned. I would imagine that will change, and the prior waival approving CAPT used to allow waivers (I know of several that made it through). However, the new DMO at BUMED (Bureau of Medicie and Surgery) is not allowing waivers. I'd recommend skipping LASIK if you haven't already had it done. If done, you can try for a waiver but I would do that VERY early, as in 4th year HPSP or July 1st of internship.
There is a priority system for PRK, with operational people with a real reason to not wear glasses (aviators, Divers including SEALS/EOD/Deep Sea, some others) rating a category 1. That now means a 1-2 month wait. Others are wainting much longer, the wait list used to be 2-3 years but I think we're down to a year or so. As a DMO, you are category 1. As an HPSP rotator, you'd be somewhere incredibly low on the food chain. You'd be out of the rotation for a week recovering, then need to make a 2 week follow-up, etc. Not likely, though certainly try. It would take one hell of a nice attending/Dept. Head. PRK is definitely painful. I am unfortunately one of the 2% or whatever who is not a god candidate, so I'm still a bit blind when I dive. ALmost any eyesight is waiverable for DMO, but not LASIK without a fight.
DD