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Depth perception is the ability of the human eye to see in three dimensions. It is often demonstrated with the measurements of length, width and height. For example, it is easy to recognize that an image is a photo, since cameras do not have accurate depth perception. That’s why when we take a picture, we know the person depicted in the image doesn't have a vase growing out of her head, but the resulting photo makes it appear that way. Optical illusions such as this illustrate how our minds perceive the visual imagery our eyes send to our brains.
Humans have a type of vision that is described as stereoscopic. The term stereoscopic comes from the Greek word stereos, meaning solid. Each eye sees an image that is separate from the image seen by the other eye. The brain processes the images and combines them into the final image seen by the brain. Eye depth perception is determined by how well both eyes function separately and how they function together to interpret images. It can be altered by changes to either eye.
This would not happen for most already seen things because your brain is tuned to judge the time and space accurately. However, your brain will not be able to fill the gap if you use one eye. Depth perception arises from a variety of depth cues. These are typically classified into binocular cues that require input from both eyes and monocular cues that require the input from just one eye. Binocular cues include stereopsis, yielding depth from binocular vision through exploitation of parallax. Since (by definition), binocular depth perception requires two functioning eyes, a person with only one functioning eye has no binocular depth perception. And hence stepping into a 3d cinema will not be an amazing phenomenon as it used to be. This is more so in people who are blinded with one eye by birth.
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