One of my characters goes blind in one eye from a car crash. I would like to know what could've exactly happened to him to cause his blindness. Basically, he's knocked out from hitting his head during the crash, and when he wakes up in the hospital, he can't see out of one eye. So does anyone know what could've happened to him? Just a side note, he doesn't lose his eye. I am open to it being discolored or something though, if that could've possibly happened.