Figure 3: Positional Tracking Systems

The perception of depth is influenced by the distance at which the eyes converge and the focal distance of the eye, referred to as vergence (left) and accommodation (right), respectively. 3-dimensional displays, which rely on stereo vision, can only influence vergence by adjusting the stereo disparity between the left and right eye, and the focal plane of the optics remains fixed. The eyes (bottom) perceive the vergence depth of the image of the sphere on the displays by the distance of the intersection of the displayed images. On the right, the accommodation distance is the distance to the focal plane at which the cube is in focus. Objects at closer and farther focal distances appear out of focus. Vergence and accommodation conflicts cause discomfort due to the disagreement in vergence and accommodation distances, particularly at close distances where accommodation cues are most influential.

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