The separation of visual axes in apposition compound eyes.
D000818:Animals; D003445:Crustacea / Q000502:physiology*; D004175:Diptera / Q000502:physiology; D006927:Hymenoptera / Q000502:physiology; D007313:Insecta / Q000502:physiology*; D009799:Ocular Physiological Phenomena; D009987:Orthoptera / Q000502:physiology; D014792:Visual Acuity; D014795:Visual Pathways / Q000502:physiology; D014796:Visual Perception / Q000502:physiology