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We can experience depth when viewing with a single eye. One or many monocular depth cues can be used to provide an experience of depth. Linear perspective and Gaussian blurring provide the illusion of depth in the figure above. Which of the horizontal yellow bars appears longer? After you answer, measure them. What do you find? Look at the image with both eyes and then with each eye.
Monocular depth perception is very inaccurate and variable. Binocular depth perception is more accurate and less variable, but provides the best accuracy to distances of about 3 meters, then provides a bit lesser accuracy to distances of about 7 meters, and thereafter diminshes greatly.
Neural units that compare action potentials per second from different neural
feeds seem to exist in each brain hemisphere and these comparators contribute to
our constructions of depth.
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