title: On an observer with abnormal colour vision.
mesh_terms: D000328:Adult; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000175:diagnosis*; D004192:Discrimination, Psychological; D005364:Field Dependence-Independence; D006801:Humans; D008266:Macula Lutea; D008297:Male; D014792:Visual Acuity; D014794:Visual Fields