TonyC said:Binocularity refers to the ability of both eyes to track the same object at the same time. This means that the image of the object falls on the fovea of each eye at the same time. This is termed bifoveal fixation. Fusion, which is the superimposition of the two images in the brain, results from bifoveal fixation. The highest degree of binocularity is stereopsis, which is three dimensional depth perception made possible by the fusion of the binocular images of an object viewed at slightly different angles.
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