Here is a rather interesting article from the Toronto Star about Snakes. I LOATHE snakes... I am terrified of them. However, putting all of my fear aside, this article is an interview with a scientist who believes that primates may have developed sight due to fear of snakes. It also suggests that at one time, humans and primates were food for them, and this is why our eyes evolved. Interesting stuff, and may very well answer that evolutionary enigma about why our sight evolved the way that it did.
Here is the link: