Binocular vision 

In binocular vision, the eyes are forward-facing and cannot move independently of each other. Each eye thus has a slightly different perspective on a scene. This allows the visual cortex of the brain to synthesize the two differing images into one cohesive mental image. These differences in perspective allow the brain to triangulate distance much more accurately, and thus result in vastly improved depth perception[?]. Although depth perception still exists without binocular vision (e.g. if you close one of your eyes), the brain must rely on secondary cues such as shadows and parallax to generate depth information, which isn't nearly as accurate.

Binocular vision is a feature common amongst many hunting animals, but also amongst primates which must rely on it to navigate complex three-dimensional environments.

Binocular vision comes at the expense of a wider field of view, meaning that an animal must rely on other senses to see what is behind it or on the periphery. For many prey species, like cows or horses, the wider field of view given by side-facing eyes and monocular vision is a better adaptation, since it reduces the chance that a predator could sneak up on them.

See also: vision

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