I need to wear glasses, and I'm pretty sure I'm not the only one. We don't have sharper/better vision, we pay more attention to what we see, just a little different. I've read that we have better peripheral vision though, but again, that's paying more attention to what we see, not that hearing people can't see well peripherally, they're just don't use it/rely on it as much.
I didn't mean 20/20 vision.... I meant that our visual sense is a lot stronger then hearing people's, we use our sight to compensate for the lack of hearing.....