title: Interchangeability among five devices that measure anterior eye distances.
abstract: OBJECTIVE
  The aim was to study the interchangeability of various devices that measure anterior chamber depth (ACD) and white-to-white (WTW) distance.
  
  
  METHODS
  Eighty right eyes of eighty patients aged 20 to 40 years were included. Their spherical equivalent ranged from -4.25 to +1.00 dioptres. Each eye's ACD and the WTW distance were measured using the following devices: a Castroviejo surgical calliper, CA-200F Corneal Analyser, Orbscan II, Pentacam HR and IOLMaster 500.
  
  
  RESULTS
  The Pentacam HR measured significantly greater ACD (p < 0.01) than the other two devices, whereas IOLMaster 500 and Orbscan II yielded comparable (p > 0.01) distances. Nonetheless, in every device comparison, the mean difference was within clinically acceptable limits. The device comparison showed that for WTW distance measurements IOLMaster 500 yields the greatest value (p < 0.01), whereas CA-200F Corneal Analyser yields the smallest one (p < 0.01).
  
  
  CONCLUSIONS
  Pentacam HR, Orbscan II and IOLMaster 500 can be used interchangeably to measure ACD, whereas Orbscan II, IOLMaster 500, Castroviejo surgical calliper and CA-200F Corneal Analyser cannot be considered interchangeable, when it comes to measuring WTW distance.
authors: Optometry Research Group (GIO), Optics Department, University of Valencia, Spain. alberto.vicent@uv.es.
authors: Alberto
authors: A
authors: Domínguez-Vicent
authors: Optometry Research Group (GIO), Optics Department, University of Valencia, Spain.
authors: Cari
authors: C
authors: Pérez-Vives
authors: Optometry Research Group (GIO), Optics Department, University of Valencia, Spain.
authors: Teresa
authors: T
authors: Ferrer-Blasco
authors: Optometry Research Group (GIO), Optics Department, University of Valencia, Spain.
authors: César
authors: C
authors: Albarrán-Diego
authors: Optometry Research Group (GIO), Optics Department, University of Valencia, Spain.
authors: Robert
authors: R
authors: Montés-Micó
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D001699:Biometry / Q000295:instrumentation*; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis* / Q000503:physiopathology; D015203:Reproducibility of Results; D055815:Young Adult
keywords: anterior chamber; anterior eye agreement; white-to-white distance