Inter- and intraobserver variability of measurements with Pentacam HR® in patients with mild to moderate keratoconus

Details

Serval ID
serval:BIB_CD14E281160E
Type
Inproceedings: an article in a conference proceedings.
Publication sub-type
Abstract (Abstract): shot summary in a article that contain essentials elements presented during a scientific conference, lecture or from a poster.
Collection
Publications
Institution
Title
Inter- and intraobserver variability of measurements with Pentacam HR® in patients with mild to moderate keratoconus
Title of the conference
ARVO E-Abstract 113/A256
Author(s)
Guber I., Hashemi K., Schötzau A., Guber J., Majo F.
Organization
Association for Research in Vision and Ophthalmology
Address
Fort Lauderdale
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Language
english
Abstract
Purpose: To evaluate inter- and intraobserver variability of indices crucial for detection of keratoconus progression derived from the Pentacam HR® (high-resolution) tomographer (OCULUS Optikgeräte GmbH, Wetzlar, Germany) in patients with mild to moderate keratoconus.
Methods: Three repeated corneal topography measurements in the 25-picture mode by two independent observers were performed. The extent of variability across a large range of measurement parameters was analyzed including anterior and posterior corneal surface measurements, pachymetry values, corneal volume, anterior chamber volume and depth, and iridocorneal angle. The intraclass correlation coefficient (ICC) between and within each investigator was calculated to assess reproducibility and repeatability, respectively.
Results: 31 eyes of 20 patients (mean age 31.6, SD ± 8.6) were included. Overall, the repeatability and reproducibility were excellent. The range of variability was reported by calculating the standard deviation of measurements. The detailed results are shown in Table 1.
Conclusions: This study shows that the Pentacam HR® tomographer provides reliable measurements in patients with mild to moderate keratoconus. However, all parameters showed a certain range of variability. This should be taken into account when assessing keratoconus progression in order to distinguish true progression from variability in measurements. In addition, the excellent reproducibility suggests that the measurements can be reliably performed by different individuals from one visit to another.
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25/01/2013 9:32
Last modification date
20/08/2019 15:47
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