I had the surgery done 8 years ago and wasn't told quite few things until recently.
I went to the Saddleback Eye Center for a consultation last year as I was considering a touch-up (tweak). I highly recommend them. Anyway, that's when I was told that the cornial flap never actually heals and reattaches to your eye. He said it's on pretty tight, but the best description is "velcro".
You can do almost any activity including swimming, but the flap can dislodge if hit by something. I always wear sun glasses around the car whenever it's running because I felt that even a flash fire could cook the flap as well. We have several pairs of clear and tinted safety glasses in the trailer but for some reason on Friday I worn my regular sun glasses.
If I had a choice, I would still have had the lasik surgery. I was a minus 6 prescription (basically blind) and now I am 20/30 or so. Contact lenses in the pits are the worst with all the spray cleaners, clutch dust, fumes, etc., and I've never had an issue until now with lasik. My eyesight in my right eye is still blurry, but I'm happy to still have an eye and I'm sure over time it will get better.
RG