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Binocular depth cues are based on the simple fact that a person's eyes are located in different places. One cue, binocular disparity, refers to the fact that different optical images are produced on the retinas of both eyes when viewing an object. By processing information about the degree of disparity between the images it receives, the brain produces the impression of a single object that has depth in addition to height and width.
Binocular depth cue creates 3D images.
Both seems to be working like reflectors One reflects on the retina convergence and the other by adjusting its lense accomodation.
Psychology - Binocular depth cue
Binocular depth cue
In 'magic eye' pictures each eye observes a slightly different view of
the same scene.
Retinal Disparity  (Binocular Disparity): A primary binocular depth
cue  which is caused by the fact that our eyes are 6-7cms apart and thus
receive slightly different retinal images. The difference in locations of
the images on each eye provides a powerful cue to distance. The brain fuses
the two retinal images together to provide us with stereoscopic vision. For
example, in 'magic eye' pictures, each eye observes a slightly different
view of the same scene and the brain fuses the two images together to
create a three-dimensional picture.
Convergence:  A primary binocular depth cue  where the eyes turn
inward to focus on an object so that a single image is formed on both
retinas.  The closer the object, the greater the convergence.  For
example, the eyes converge when catching a ball.
Accommodation:  A primary binocular depth cue  which involves the
adjustment of the shape of the lens to change the focus of the eye. The
lens  bulges when focusing on nearby objects, such as the eye of a
needle, and elongates to focus on distant objects, such as a bird flying.
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