I had it one month ago and I tried having it in the surgery chair but it was horrible so I got booked into the hospital to have the whole lot done under a general anesthetic.
The lazer is the brightest green and HURTS, dont listen to people who say it wont hurt, I asked a similar question before i had to have it done on YA and everyone said it was OK, but the heck it is!
I had to have it done as I have Diabetes and it was a really invasive procedure for me, I could not see for a whole week and now when I go into light room froma dark room it takes about 30 secs to adjust, and visa versa.
If you want it so that you dont wear glasses I think it is a bit different, but mine has awfull.
Sorry to scare you but I wish someone had been this honest for me when I asked, then I could have prepared for it better.
I am 24 and was told that it is worse for older people.