Retinal disparity happens because we see a slightly different image from each eye. Our brain is able to compute the disparity or difference between the two images and tell how far away an object is. The greater the disparity the further away an object is. These two photographs were taken of the same hand in the same position however the photo on the right was taken with the camera held in front of my right eye and the photo on the left with the camera held in front of the left eye. As you can see in each picture the thumb appears to be in a different location in relationship to the corner of the wall located further away even though nothing in the image actually moved.
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