What kind of eye problem can cause illusions/seeing things distorted?!

It happens at night. I have had lasik surgery so I see better than 20/20, and this has been happening before I got my surgery. I am seeing a ophthalmologist in two weeks but I was just wondering if anyone knows anything. It's not a psychological problem because I asked my psychiatrist today about it and he's the one who suggested I see an ophthalmologist.