There is some halo effect. I notice it tends to be worse too when my eyes are dry. Especially with Lasek it takes longer to produce tears again naturally so lubrication is very important. I would say the thing I notice the most at night is that I misjudge taking a turn sometimes, like it seems i come up on turning into a parking lot entrance faster. Kind of like I see the entrance later than I used to. I don't know why that is but I have heard other people say the same thing.