What is binocular shift?

Some articles on binocular shift:

3D Television - Technologies - Producing Technologies
... One accounting for perspective and the other for binocular shift ... the Z and Y coordinates of the object point, by a factor of D/(D-x), while binocular shift contributes an additional term (to the Y coordinate only) of s*x/(2*(D-x)), where D is the distance from the selected ... The binocular shift is positive for the left-eye-view and negative for the right-eye-view ...

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