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Repeatability, reliability and reproducibility of pentacam-derived fourier transfom analysis of videokeratographic data in normal keratoconic and cross-linked corneas

Poster Details

First Author: H.Sideroudi GREECE

Co Author(s):    G. Labiris   F. Ditzel   K. Georgatzoglou   V. Kozobolis     

Abstract Details


To assess the intrasession, intersession and interobserver repeatability of Fourier Transfom analysis of Videokeratographic Data of Pentacam in normal (CG), keratoconic (KCG) and post-CXL corneas (CXLG).


Eye Institute of Thrace, Alexandroupolis, Greece


95 normal eyes formed the CG, 33 keratoconus eyes formed the KCG, while 34 eyes, which already had received CxL treatment, formed the CXLG. Fourier Analysis of keratometric data were obtained using Pentacam, by 2 different operators within each of 2 sessions. Precision (Pre), repeatability (COR) and Intraclass Correlation Coefficient (ICC), were calculated for evaluating intrassesion and intersession repeatability for following parameters: Spherical Component (SphRmin, SphEcc), Maximum Decentration (Max Dec), Regular Astigmatism (Ast. Center, Ast. Periph.), and Irregularitiy. Bland-Altman analysis was used for assessing interobserver repeatability.


SphRmin, SphEcc, parameters were presented to be repeatable, reliable and reproductible in all groups (ICC>90.04). For both observers, best precision and lowest Range of Agreement (ROA) was found for MaxDec and Regular Astigmatism [<0.19 and <0.1 (NG), <0.49 and <0.16 (KCG), <0.15 and 0.36 (CXLG), respectively].


The pentacam system provides accurate measurements of Fourier Tranform Keratometric Data. A single Pentacam scan will be sufficient for most clinical applications. FINANCIAL DISCLOUSRE: NONE

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