title: Letter: Colour disturbance as a symptom.
mesh_terms: D000550:Amblyopia / Q000209:etiology*; D003118:Color Perception; D003486:Cyanides / Q000633:toxicity; D006801:Humans; D008297:Male; D010947:Plants, Toxic; D012907:Smoking / Q000150:complications*; D014026:Nicotiana
chemical_list: D003486:Cyanides