"Binocular vision, binocular being Latin, as in bini for double and oculus for eye, is an amazing trait. So valuable is double eye vision that all animals have two eyes or more. The first reason being that if you lose one eye you have a spare, the second being that it greatly expands your field of vision. In humans, among many other animals, this binocular vision is taken a step further by having our two eyes both point forward. While this gives us a narrower field of vision than say, a bird, it also gives us a special ability, stereopsis or the ability to see one image with depth perception." - Steven Perez from Bookmarklet