PRK just takes longer to heal, and involves a bit more pain.
There is a chance for Retinal Detachment in extremely nearsighted people anyway, apparently it can be increased with lasik. Also corneal collapse can occur if they take too much off. A good surgeon should tell you what your chances are for complications.
The flaps can come loose from scuba, contact to the eye, excessive g forces. But over time these lessen greatly. For military pilots the fear was during ejection the flap may dislodge leaving them with bad vision in a possible bad situation. No chance of this with PRK.
There are also intacts which are disks they implant right into the eye that change the shape.
The problem with hard lenses, is first some people do not tolerate them well, and second in increases the chances of corneal abrasion. and eye ulcers.
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