The quality or condition of having or using two eyes together; the property of sight that depends on both eyes functioning as a pair.
From Latin 'bi-' (two) and 'oculus' (eye) plus '-arity' meaning state or quality; developed as a technical term in vision science and physiology in the 19th century.
Binocularity is why humans and predators see depth so well—your two eyes give you 3D vision, which is why predators evolved forward-facing eyes while prey animals have eyes on the sides of their heads.
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