My left pupil is larger than my right. Why?

I was playing a softball game for fun and a pitch was made to home base. The pitch was off and hit my glasses at my left eye. My glasses probably prevented a black eye and massive damage. But now my pupil is larger than the other, and my eye had little contact. Why is this? The ball wasn't really fast either. Is it Anisocoria? Is it a parasympathetic nerve defect, possibly an oculomotor nerve palsy? I hope not.... Thanks for the answer! :D