Major league base ballers, as a rule, have scary good eyesight.

I always thought that 20/20 eyesight was perfect. But I read a great piece by Malcolm Gladwell in the New Yorker, and found out you can go better than that.

Turns out if you have 20/15 vision, you can see at 20 feet. Someone with 20/20 vision can see at 15 feet. (And as an interesting aside an eagle is thought to have 20/5 vision).