Motion parallax and absolute distance.
D000065:Accommodation, Ocular; D003867:Depth Perception; D004215:Distance Perception; D005403:Fixation, Ocular; D006257:Head / Q000502:physiology*; D006801:Humans; D007600:Judgment; D008297:Male; D009068:Movement; D011601:Psychophysics; D012858:Size Perception; D014785:Vision, Ocular; D014794:Visual Fields; D014796:Visual Perception