Well, I'd say let the person decide.
I had a friend who was offered a full ride to the Air Force Academy, and they were going to train him to be a fighter pilot, which is what he had always wanted to be.. All of this was contingent on a physical and psychological exam. He had both, he aced both... except for being colorblind. They ended up completely taking the offer away because of it. He would have said yes to this procedure, it was his dream. I'd say if the person doesn't want/need it, they shouldn't get it. If the do, then don't deny them. Maybe put an age limit on it, like Lasic and all of those procedures.