Although motion parallax (the extent of image motion depending on object distance) is one of the most important cues, additional information is required to assign the sign (near/far) of depth.

Specifically, discomfort was due to a specific sensory cue called motion parallax, which is defined as the relative movement of different parts of the environment.

This is called motion parallax, and it occurs because objects viewed at different distances move across the retina at different speeds. “Our brains rely on motion parallax cues as well as cues from ...