title: Comparison of two pupillometers in determining pupil size for refractive surgery.
abstract: OBJECTIVE
  To compare a handheld and a digital pupillometer in determining pupil size in a population of refractive surgery candidates (group 1) and after implantation of an Artisan phakic intraocular lens (PIOL) for correction of myopia (group 2).
  
  
  METHODS
  Pupil size was measured with the Colvard and Procyon pupillometers in 121 eyes in group 1 and 83 eyes in group 2. Pupil sizes measured with the Colvard device were compared with the scotopic, mesopic-low and mesopic-high measurements taken with the Procyon pupillometer in both groups. Analysis of comparison between pupil measurements was performed according to methods described by Bland and Altman.
  
  
  RESULTS
  The mean Colvard scotopic pupil diameter, scotopic, mesopic-low and mesopic-high Procyon pupil diameters were 5.86 +/- 0.81 mm, 6.42 +/- 0.88 mm, 5.55 +/- 0.95 mm and 4.21 +/- 0.73 mm in group 1 and 5.32 +/- 0.67 mm, 6.14 +/- 0.81 mm, 5.33 +/- 0.78 mm and 4.02 +/- 0.55 mm in group 2, respectively. The Colvard diameter compared most favourably with the Procyon mesopic-low diameter (group 2; p = 0.78).
  
  
  CONCLUSIONS
  Measurements of pupil diameter with the Colvard pupillometer correlated best with measurements taken by the Procyon pupillometer under standardized mesopic-low light conditions. We believe that digital binocular infrared pupillometry is advantageous for obtaining standardized measurements of pupil size.
authors.affiliation: Department of Ophthalmology, University Hospital Maastricht, Maastricht, The Netherlands.
authors.forename: Sander
authors.initials: S
authors.lastname: Bootsma
authors.forename: Nayyirih
authors.initials: N
authors.lastname: Tahzib
authors.forename: Fred
authors.initials: F
authors.lastname: Eggink
authors.forename: John
authors.initials: J
authors.lastname: de Brabander
authors.forename: Rudy
authors.initials: R
authors.lastname: Nuijts
mesh_terms: D000328:Adult; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D006801:Humans; D007498:Iris / Q000033:anatomy & histology; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000502:physiology*; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011184:Postoperative Period; D011680:Pupil / Q000502:physiology*