title: Comparison of dynamic digital pupillometry and static measurements of pupil size in determining scotopic pupil size before refractive surgery.
abstract: OBJECTIVE
  To compare 2 digital infrared pupillometers.
  
  
  METHODS
  Anterior Segment Service, Moorfields Eye Hospital, London, England.
  
  
  METHODS
  Eighty-eight eyes of 44 healthy subjects were recruited into the study. The scotopic pupil size was measured with 2 instruments, a digital pupillometer (Procyon) and a Hartman-Shack wavefront aberrometer (Visx WaveScan). Agreement between the instruments was assessed.
  
  
  RESULTS
  There were 21 men and 23 women with a mean age 38.1 years +/- 9.2 (SD) (range 23 to 62 years). The mean scotopic pupil diameter was significantly larger with the WaveScan (6.61 +/- 0.92 mm) than with the Procyon pupillometer (6.40 +/- 0.90 mm), P<.001.
  
  
  CONCLUSIONS
  There was good agreement in measurement of scotopic pupil size between the two instruments. The larger pupil diameter found with the Visx WaveScan than with the Procyon digital pupillometer probably represents the different illumination level used by each instrument, the effects of accommodation, and target fogging.
authors.affiliation: Anterior Segment Service, Moorfields Eye Hospital, London EC1V 2PD, England. sanjeewa_w@hotmail.com
authors.forename: Sanj S
authors.initials: SS
authors.lastname: Wickremasinghe
authors.forename: Guy T
authors.initials: GT
authors.lastname: Smith
authors.forename: Julian D
authors.initials: JD
authors.lastname: Stevens
mesh_terms: D000328:Adult; D001699:Biometry / Q000379:methods; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007259:Infrared Rays; D007498:Iris / Q000033:anatomy & histology*; D008297:Male; D008875:Middle Aged; D055254:Night Vision / Q000502:physiology*; D011300:Preoperative Care; D011680:Pupil / Q000502:physiology*; D054140:Refractive Surgical Procedures; D015203:Reproducibility of Results; D055815:Young Adult