Based on the principles of depth perception, explain why the task described in the case study becomes much harder when performed with only one eye open.

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Binocular cues are visual signals used to perceive depth that depend on the simultaneous use of both eyes. By integrating the slightly different information received from each eye's unique vantage point, the brain can establish a sense of three-dimensional space.

Binocular Cues

As a primary example of a binocular cue, binocular disparity refers to the subtle difference between the visual images that each eye receives. Because the eyes are horizontally separated, they capture slightly different views of the world, and the brain uses this disparity to compute depth.

Binocular Disparity

Stereoblindness is a condition characterized by the inability to use binocular cues to perceive depth. Individuals with this condition must depend solely on monocular cues to interpret the three-dimensional world.

Stereoblindness

The nervous system possesses specialized cells that respond to binocular depth cues. For these cells to be maintained and function later in life, they must be activated by visual input during a critical period in early development.

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