title: The nonius horopter. I. History and theory.
mesh_terms: D004215:Distance Perception; D005403:Fixation, Ocular; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D008962:Models, Theoretical; D010827:Physiology / Q000266:history; D012160:Retina / Q000502:physiology; D014785:Vision, Ocular; D014794:Visual Fields / Q000266:history*