title: Repeatability of ocular measurements with a dual-Scheimpflug analyzer in healthy eyes.
abstract: OBJECTIVE
  To assess the repeatability of the Galilei dual Scheimpflug analyzer (GDSA) in anterior segment examination.
  
  
  METHODS
  Fifty-two eyes from 52 healthy volunteers were prospectively and consecutively recruited. Anatomic, axial, refractive, and instantaneous parameters were measured with GDSA to provide a complete characterization of the anterior segment. Repeatability was assessed calculating intraclass correlation coefficient (ICC), and coefficient of variation (COV).
  
  
  RESULTS
  Correlation among repeated measurements showed almost perfect reliability (ICC>0.81) for all parameters except thinnest central corneal thickness (CCT) (0.78), corneal thickness average out (0.79), and posterior axial curvature average out (0.60). Repeatability was excellent (COV<10%) for all parameters except anterior chamber volume and, superior iridocorneal angle and eccentricities. In these last three parameters, repeatability limits were excessively high compared to the mean.
  
  
  CONCLUSIONS
  GDSA in healthy young persons had an almost perfect correlation in measuring anatomic, axial, instantaneous, and refractive parameters with greater variability for peripheral terms. Repeatability of anatomical parameters like pachymetry, anterior chamber, or iridocorneal angle and eccentricity were limited. In healthy young persons, the other evaluated parameters had very good repeatability and their limits of agreement showed excellent clinical results for this device.
authors.affiliation: Department of Applied Physics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain ; Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Lopez de la Fuente
authors.affiliation: Department of Applied Physics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain ; Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Sanchez-Cano
authors.affiliation: Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain ; Department of Surgery, Gynecology and Obstetrics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Francisco
authors.identifier: 0000-0002-9250-9060
authors.initials: F
authors.lastname: Segura
authors.affiliation: Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain ; Department of Physiology and Pharmacology, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Lorena
authors.initials: L
authors.lastname: Fuentes-Broto
authors.affiliation: Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain ; Department of Surgery, Gynecology and Obstetrics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain ; Department of Ophthalmology, Lozano Blesa University Hospital, Avenida San Juan Bosco, 15, 50009 Zaragoza, Spain.
authors.forename: Isabel
authors.identifier: 0000-0003-0349-9997
authors.initials: I
authors.lastname: Pinilla
mesh_terms: D000328:Adult; D063171:Corneal Pachymetry / Q000379:methods*; D019781:Corneal Topography / Q000379:methods; D003941:Diagnostic Techniques, Ophthalmological; D004867:Equipment Design; D005123:Eye / Q000473:pathology; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D009799:Ocular Physiological Phenomena; D011446:Prospective Studies; D015203:Reproducibility of Results; D012984:Software; D055815:Young Adult