Helmholtz on eye movements.
D001703:Biophysics / Q000266:history*; D005133:Eye Movements; D049672:History, 19th Century; D006801:Humans; D007700:Kinetics; D008433:Mathematics; D008959:Models, Neurological; D009434:Neural Pathways / Q000502:physiology; D009482:Neurophysiology / Q000266:history*; D011601:Psychophysics / Q000266:history; D014796:Visual Perception / Q000502:physiology