Grainger I agree, there is a risk that is reducing all the time. I guess I got lucky, I have ended up with plano prescription and the slight night halos that I had with contacts have gone completely since surgery.
It is possible for a number of things that can happen in life to affect your vision, but by undergoing laser surgey you are electing to take that risk.
Some of my flying activities would be curtailed if I lost the class 1, but my livelihood would be OK. Thinking carefully about it, if I depended on being at the sharp end I probably would not have risked it.
btw, the BCVA line would come back with lesser correction, and my clinic said they would do a free second procedure if necessary. The biggest risk with LASIK is accidentally rubbing your eyes soon after surgery and rippling the flap.