Retinal Disparity - difference between the visual images that each eye perceives because of the different angles in which each eye views the world because of each eye's inability to see through their peripheral area
http://www.sandlotscience.com/EyeonIllusions/images/finger_sausage.jpg
In this picture, we think that the "floating finger" is actually floating, but in reality, because we do not have peripheral vision when our one eye is covered, we think that the finger is floating.
Convergence - When your eyes turn inwards in order to properly perceive depth. We also use this to see if objects are close or far away.
http://study.com/cimages/multimages/16/railroad_tracks.png
In this picture our eyes need to turn inwards so that we can see that the railroad tracks stretch out really far. We use convergence to perceive depth.
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