title: Repeatability and Reproducibility of Anterior Segment Measurements in Normal Eyes Using Dual Scheimpflug Analyzer.
abstract: OBJECTIVE
  To assess the repeatability and reproducibility of anterior segment measurements including aberrometric measurements provided by a dual Scheimpflug analyzer (Galilei) system in normal eyes.
  
  
  METHODS
  Three repeated consecutive measurements were taken by two independent examiners. The following were evaluated: total corneal power and posterior corneal power, corneal higher-order wavefront aberrations (6.0 mm pupil), pachymetry at the central, paracentral, and peripheral zones, and anterior chamber depth (ACD). Repeatability was assessed by calculating the within-subject standard deviation, precision, repeatability, and intraclass correlation coefficient (ICC). Bland-Altman analysis was used for assessing reproducibility.
  
  
  RESULTS
  Thirty eyes of 30 patients were included. The best ICC values were for corneal pachymetry and ACD. For both observers, acceptable ICC was also achieved for the other parameters, the only exceptions being posterior corneal astigmatism and total high order aberration. The 95% LoA (Limits of Agreement) values for all measurements showed small variability between the two examiners.
  
  
  CONCLUSIONS
  The Galilei system provided reliable measurements of anterior segment parameters. Therefore, the instrument can be confidently used for routine clinical use and research purposes.
authors: Ulucanlar Eye Training and Research Hospital, Ankara, Turkey.
authors: Zeynep
authors: Z
authors: Altıparmak
authors: Pamukkale University Faculty of Medicine, Department of Ophthalmology, Denizli, Turkey.
authors: Ramazan
authors: R
authors: Yağcı
authors: Erciş State Hospital, Clinic of Ophthalmology, Van, Turkey.
authors: Emre
authors: E
authors: Güler
authors: Adıyaman University Training and Research Hospital, Clinic of Ophthalmology, Adıyaman, Turkey.
authors: Zeynel
authors: Z
authors: Arslanyılmaz
authors: Turgut Özal University Faculty of Medicine, Department of Public Health, Ankara, Turkey.
authors: Metin
authors: M
authors: Canbal
authors: Gazi University Faculty of Medicine, Department of Ophthalmology, Ankara, Turkey.
authors: İbrahim F
authors: İF
authors: Hepşen
keywords: Galilei; interobserver repeatability; intraobserver; wavefront aberrations