Retinal Disparity is when the brain compares images from each eye and computes the relative distance between them.
http://study.com/cimages/multimages/16/retinal_disparity_view.png
The difference between the left and right image is the brain's retinal disparity.
Convergence
Convergence is the way which the eyes converge inward when looking at an object
The closer the eyes converge, the closer the object is. In this picture, the object is very close to the very tired student that procrastinated his assignments.
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