How did you scratch it? Have you flushed it a couple of times to make sure there isn't something stuck?
I'd call your PCP or hit a walk in clinic (unless you already have an eye doctor) I scratched my eye last year when a tree branch snapped back and hit me in the eye. I flushed it a few times and figured it would be fine the next day. When it wasn't, I went to a walk in clinic and they gave me an ointment that immediately relieved the discomfort.