Retina reference frame and object reference frame must match {viewpoint consistency constraint}.
Visual features can stay the same when observation point changes {viewpoint-invariance, vision}. Brain stores such features for visual recognition.
People have a reference point {visual egocenter} {egocenter, vision} on line passing through nosebridge and head center, for specifying locations and directions.
1-Consciousness-Sense-Vision-Physiology
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Date Modified: 2022.0225