title: Keratometry evaluations with the Pentacam high resolution in comparison with the automated keratometry and conventional corneal topography.
abstract: OBJECTIVE
  To determine the reliability and repeatability of keratometry (K) measurements obtained with the Pentacam high resolution (HR), automated keratometry, and corneal topography systems.
  
  
  METHODS
  The right eyes of 46 healthy subjects were examined prospectively. Keratometry measurements in the flat (Kf) and steep (Ks) meridians were taken by 2 independent investigators with the Pentacam HR (Oculus, Wetzlar, Germany) followed by automated keratorefractometry (KR-8100; Topcon, Tokyo, Japan), and corneal topography (TMS-4; Tomey, Erlangen, Germany).
  
  
  RESULTS
  The mean K readings of the Pentacam HR, automated keratometry, and corneal topography were 43.40/43.34 diopter (D), 43.99/43.98 D, and 43.80/43.83 D, respectively. The difference between the values was statistically significant (P < 0.0001, repeated measures analysis of variance). Strong significant correlation was observed between the Pentacam HR and keratometry (Kf: r = 0.952/0.954; Ks: r = 0.845, Spearman rank test), and Pentacam HR and corneal topography (Kf: r = 0.933/0.930; Ks: r = 0.838/0.829) (P < 0.0001). No significant difference was presented between the 2 investigators for any of the instruments (P = 0.215-0.983). Moreover, high correlation was found between the K readings of the observers (interoperator intraclass correlation coefficients ranged from 0.95 to 0.99).
  
  
  CONCLUSIONS
  The Pentacam HR provided reliable K measurements in clinical practice in comparison with an automated keratometer and a corneal topographer. Based on the results, for patient follow-up, one keratometry device is recommended.
authors.affiliation: Medical and Health Science Center, Department of Ophthalmology, University of Debrecen, Debrecen, Hungary. lmodis@dragon.klte.hu
authors.forename: László
authors.initials: L
authors.lastname: Módis
authors.forename: Eszter
authors.initials: E
authors.lastname: Szalai
authors.forename: Bence
authors.initials: B
authors.lastname: Kolozsvári
authors.forename: Gábor
authors.initials: G
authors.lastname: Németh
authors.forename: Attila
authors.initials: A
authors.lastname: Vajas
authors.forename: András
authors.initials: A
authors.lastname: Berta
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019781:Corneal Topography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010781:Photography / Q000379:methods*; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D015203:Reproducibility of Results; D055815:Young Adult