Vision has a profound effect on one's ability to perform in sports. In addition to seeing clearly, peripheral awareness and the efficiency for the eyes to be able to aim and focus together are skills that are necessary to be able to perform effectively. It's quite obvious how important depth perception is in most sports.

What's interesting is that a lot of the above vision skills can be enhanced with training. There are a few eye doctors who specialize in this area. Enhancing vision skills is often overlooked as a means to improving one's performance in a particular sport.