Something about laser surgery which may or may not be true....
My optician (who I appreciate has a vested interest in these things) made the following point. He said that most people get longer sighted as they get older, and the typical eyesight deficiency in the young is short sightedness. He suggested that what laser surgery does is "move the datum" point. That is, in my case, my worst eyetest gave me -1.5 in both eyes, when I was 22. I'm now 38, and have hit -1.0 in both eyes, and he expects me to be at zero by about 44, then I drift off into the long sightedness of old age, and I should get (worst case) to about +2 by the time I push up the daisies. BUT - if I had had my eyesight lasered to zero when I was at -1.5, my worst case would have been 1.5+2=3.5 - rather worse....
As I say, he is an optician, and has a vested interest in keeping me in contact lenses and solutions for the foreseeable future. But an interesting viewpoint (scuse the pun) anyway.