title: Scotopic measurement of normal pupil size with the Colvard pupillometer and the Nidek auto-refractor.
abstract: OBJECTIVE
  To compare prospectively, pupil size with the Nidek AR700A auto-refractor and the Colvard pupillometer.
  
  
  METHODS
  Pupil diameter was measured in 46 eyes at 2 min intervals in a low mesopic and under photopic light conditions.
  
  
  RESULTS
  The mean pupil diameter was 4.8+/-1.0mm with the Colvard pupillometer and 4.8+/-0.9mm with the Nidek auto-refractor in low mesopic light conditions. The mean photopic pupil diameter was 3.3+/-0.8mm with the Colvard pupillometer and 3.9+/-0.8mm with the Nidek auto-refractor.
  
  
  CONCLUSIONS
  The pupil sizes are very similar with both instruments.
authors.affiliation: Birmingham and Midland Eye Centre, Birmingham, UK.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Mantry
authors.forename: Somnath
authors.initials: S
authors.lastname: Banerjee
authors.forename: Shehzad
authors.initials: S
authors.lastname: Naroo
authors.forename: Sunil
authors.initials: S
authors.lastname: Shah
mesh_terms: D000328:Adult; D003623:Dark Adaptation / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009907:Optometry / Q000295:instrumentation / Q000379:methods*; D011446:Prospective Studies; D011680:Pupil / Q000502:physiology*