I have personal experience of the surgery, though I am not a pilot.
I had Lasek which involves dissolving the cells of the cornea with alcohol prior to the laser treatment (which reduces the risk of future problems with impact injuries). I was -4.0 in both eyes. Post treatment I am 20/20 although my night vision has definitely suffered. I now see a halo around tungsten/sodium type lights and any sharp halogen or LED style lights 'star'. Dusk/dull conditions also need more concentration as there is less contrast and movement is sometimes harder to see than previously when wearing contact lenses.
I consider myself safe to drive at night, although it does amaze me that the legal standard of vision is so lax. I'm not sure if there is more rigour for a pilot - i.e. testing in varying conditions, but I do think there ought to be.