My left eye was minus 10 dioptres short sighted ( I couldnt pass the medical for CPL WITH glasses, even the second line was very blurred) I had PRK Laser in Sydney in 1993 and it fixed it so that I can pass the medical now with no correction in my left eye, but its not perfect. I would recommend it if you cant meet the std now with glasses, but dont risk it otherwise. I had nothing to lose. That said my vision has been stable for about 7 years and hopefully it stays that way. There is a natural risk of retinal detachment in very short sighted eyes, which can be brought on with some of the medication used after this proceedure.
STAY AWAY from Pilocarpaine ( I cant spell it), it caused me to have a detachment but luckily they fixed it ok.
I believe the Lasers and proceedures are way better nowadays anyway.
Good Luck.