Glad you're OK. Eye injuries are no joke.
This exact thing happened to my uncle. My cousin was using a hedge trimmer and shot a rock at my uncle. Hit him directly in the eye and they took him to the doctor. His retina is intact, but the muscles that open and close the eye to let light in detached, so if you see him outside it always looks like he is high as a kite in one eye, and the other eye is about the size of a pin prick (refering to the black part in both) to compensate. My uncle has been to eye surgeons since and they tell him they can attemp to fix it, but that it probably won't work as well as it used to and not much better than it does now anyway, so he opted to leave it alone and avoid the irritation.
I always make my wife wear gloves, eye protection, and hearing protection when she mows the lawn, and I did it even before my uncle had his accident, so its good to see people start a thread so hopefully others will learn from their mistakes and not repeat them.