title: Response of the pupil to tropicamide is not a reliable test for Alzheimer disease.
abstract: OBJECTIVE
  To confirm the putative hypersensitivity of the pupil to a weak mydriatic in persons with Alzheimer dementia.
  
  
  METHODS
  Twenty patients with Alzheimer dementia and 20 control subjects were examined. Automated binocular infrared pupillography was performed in the dark after instillation of 0.01% tropicamide or placebo. Ocular penetration of eye drops was assessed simultaneously using 2% fluorescein sodium as a tracer.
  
  
  METHODS
  Rochester, Minn.
  
  
  METHODS
  Twenty patients and 20 cognitively normal control subjects from the Alzheimer's Disease Patient Registry of the Mayo Clinic, Rochester, Minn.
  
  
  METHODS
  Percent change in the diameter of the pupil following topical ocular instillation of a diluted concentration of the mydriatic drug tropicamide and penetration of topically applied fluorescein into the aqueous humor.
  
  
  RESULTS
  No statistically significant difference was found between patients with Alzheimer disease and control subjects in either the mydriatic response of the pupil or in the rate of penetration of topically applied fluorescein.
  
  
  CONCLUSIONS
  No evidence of pupillary hypersensitivity to an anticholinergic mydriatic drug was found in patients with Alzheimer disease or any evidence that this putative hypersensitivity could be used as an early, simple diagnostic test for Alzheimer disease.
authors.affiliation: Department of Ophthalmology, Mayo Clinic, Rochester, Minn., USA.
authors.forename: J S
authors.initials: JS
authors.lastname: FitzSimon
authors.forename: S C
authors.initials: SC
authors.lastname: Waring
authors.forename: E
authors.initials: E
authors.lastname: Kokmen
authors.forename: J W
authors.initials: JW
authors.lastname: McLaren
authors.forename: R F
authors.initials: RF
authors.lastname: Brubaker
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D015878:Mydriasis; D010919:Placebos; D011680:Pupil / Q000187:drug effects* / Q000502:physiology*; D014331:Tropicamide / Q000494:pharmacology*
chemical_list: D010919:Placebos; D014331:Tropicamide