title: Measurements of anterior chamber depth, white-to-white distance, anterior chamber angle, and pupil diameter using two Scheimpflug imaging devices.
abstract: OBJECTIVE
  To compare the ocular anterior chamber depth, white-to-white distance, anterior chamber angle, and pupil diameter, as measured with two different Scheimpflug imaging devices.
  
  
  METHODS
  This transversal study included 80 right eyes from 80 subjects aged from 20 to 40 years. Their spherical equivalents ranged from -4.25 to +1.00 diopters (D). Each eye's anterior chamber depth, white-to-white distance, anterior chamber angle, and pupil diameter, were measured for far vision using both the Galilei G4 (double Scheimpflug camera) and the Pentacam HR (single Scheimpflug camera) systems.
  
  
  RESULTS
  Mean anterior chamber depths were calculated as 3.12 ± 0.23 mm and 3.19 ± 0.24 mm when measured with the Galilei G4 and the Pentacam HR, respectively. The mean white-to-white distance measured was 11.84 ± 0.31 mm and 11.90 ± 0.43 mm when measured with the Galilei G4 and the Pentacam HR, respectively. Mean pupil diameters were measured as 3.22 ± 0.58 mm and 3.22 ± 0.52 mm when measured with the Galilei G4 and the Pentacam HR, respectively. Finally, the mean anterior chamber angle was 34.30 ± 2.86 degrees when it was measured with the Galilei G4, and 39.26 ± 2.85 degrees when measured with the Pentacam HR. A comparative analysis revealed that the Galilei G4 yielded a significantly lower (P<0.05) measurement for the anterior chamber depth, anterior chamber angle, and pupil diameter, than the Pentacam HR system. Comparable values (P>0.05) for both devices were obtained for the white-to-white distance measurements.
  
  
  CONCLUSIONS
  The Galilei G4 and Pentacam HR Scheimpflug systems cannot be used interchangeably because they produce significant measurement differences.
authors.affiliation: Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Domínguez-Vicent
authors.affiliation: Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Monsálvez-Romín
authors.affiliation: Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
authors.forename: Antonio Jesus Del
authors.initials: AJ
authors.lastname: Aguila-Carrasco
authors.affiliation: Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
authors.forename: Santiago
authors.initials: S
authors.lastname: García-Lázaro
authors.affiliation: Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
authors.forename: Robert
authors.initials: R
authors.lastname: Montés-Micó
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology*; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D007498:Iris / Q000033:anatomy & histology*; D010781:Photography / Q000295:instrumentation; D011680:Pupil; D055815:Young Adult