Binocular Cues are crucial tools in determining the extent
of a human’s depth perception, that is, the ability to see both near and far. Because
our eyes are separated by several inches, each of our retinas pick up different
images, and the differences between them are called the retinal disparity.
Because it is more difficult for the eyes to perceive a single image of objects
closer to the retina, the closer the object, the greater the disparity. The
pictures below illustrate the concept of retinal disparity; imagine that the top picture is the image received by the left eye and the bottom image is received
by the right, and the same placement of the finger and camera are used in both
images. Because the finger is very near to the retinas, it has a very high disparity,
meaning that the image of the finger differs between the two pictures. However,
because the globe is farther away, it has a lower disparity, and as a result
the two images of the globe are relatively similar in placement.
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