Dang man, that sucks. At least your eye wont have permanent damage. I have had a few close calls over the years and always wear hearing protection, glasses, and gloves when using any kind of grinder.
I usually do too, all it takes is that one time, and your screwed. I'm going to get to work, otherwise my bad mood might magnify by the fact I had to take the day off because of it. My eye feels alright.