Key points

Stereovision allows us to merge input from both eyes for a more precise depth perception.

Stereo deficiency affects around 5 percent of people, increasing sharply with age.

Recovery in adulthood is possible as documented in some real-life cases.

Our ability to perceive the rich, three-dimensional nature of the world depends on stereopsis. It is a process by which the brain combines slightly different images from each eye (binocular disparity) into a single depth-rich view. This function plays a vital role in accurate depth estimation, visuomotor control, and many everyday tasks.

Binocular convergence is when both eyes rotate inward to focus on an object. The closer the object, the larger the angle between the eyes’ lines of sight, giving the brain a depth cue. Source: Sar

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