title: Sudden visual loss.
mesh_terms: D000208:Acute Disease; D001766:Blindness / Q000175:diagnosis / Q000209:etiology*; D005128:Eye Diseases; D006801:Humans; D009898:Optic Disk; D009902:Optic Neuritis / Q000150:complications*; D012164:Retinal Diseases / Q000150:complications