Don't remember how bad my distance vision was before I had Lasik, but I was corrected to something like 20/15 in my right eye and 20/20 in my left. I had worn glasses since around the age of 10 and did fine without them following the surgery.
I did have problems with ghosting immediately and they never went away. This is double vision that only occurred with bright lights and a dark background, so I had to get used to seeing two traffic lights from a distance that slowly merged together as I got closer. The thing that bummed me out the most was that I couldn't really enjoy the night sky as much after the Lasik, used to love looking at the moon and stars and that were only times here and there when the ghosting was minimized enough that it was still fun. It was also more difficult to play outfield under the lights after the surgery as the ball was generally doubled when I first picked it up. The two images were clear, just irritating that there were two!!
I think I hurt myself somewhat by being impatient, believe the doctor told me to get no wind in my eyes for two or three weeks. I was road biking with coworkers nearly every day at lunch and kept bugging him about that, finally he got frustrated with me after a week or so and said I could ride with goggles. I bought ski goggles that were vented so I still got some breeze across my eye, then woke up the day after with pretty blurry vision. It recovered, but I don't think it ever completely recovered to the best it was within a week after the procedure. The ghosting was an issue from immediately after Lasik, but I think my stupidity about getting back on the bike also interfered with recovering from that, too. A coworker who used the same doctor told me that his healing seemed to be affected by an obnoxious coworker who put him in a headlock at his desk and forced him to tap out, said that put some pressure on one eye and he felt that it was worse after that.
I do remember that they were having a horrible time trying to measure my dilated pupil and the technician suggested that my iris/pupil might be too large for their equipment. She eventually got a reading, but I did have thoughts about calling the whole thing off after that...maybe the "big baby blues" that one of my GFs loved to praise when I was in HS were not the best match for Lasik.
This is all from when the flaps for surgery were still cut with a blade, I would guess that the ones that are now made with a laser might heal a lot better (without any wind).