For the vast majority of candidates, it's a life changing experience for the better, and well worth the minimal risk. Mine reverted in one eye, but I'm glad I did it regardless and have zero regrets. Just luck of the draw, really.

Who wants to play sand-in-my-eyeballs roulette? If you win you don't have to wear glasses anymore, and if you lose it will always feel like there's sand in your eyeballs.