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Nilgun Yildirim, Ender Golemez, Yasemin Yaz, Hikmet Basmak, Afsun Sahin; The reproducibility of Pentacam HR and Orbscan in healthy and keratoconic corneas. Invest. Ophthalmol. Vis. Sci. 2012;53(14):118.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the reproducibility of Pentacam HR and Orbscan II system in healthy and keratoconic corneas.
One hundred healthy subjects and ninety three keratoconus patients were enrolled in this study. Keratoconus patients were divided into 4 groups according to Amsler-Krumeich classification. An experienced observer acquired two consecutive measurements using Pentacam HR and Orbscan II from each eye. The repeatability data were analyzed using repeated measures Two-way ANOVA test. The correlation between first and second readings were evaluated using Pearson correlation test. p<0.05 was considered statistically significant.
The mean age of the control subjects were 31.5±8patients were 27.1±9 years. Mean keratometry, minimum pachymetry, central corneal thickness, anterior best fit sphere, maximum anterior elevation was significantly different between two consecutive Pentacam HR measurements. Mean keratometry, 5 mm astigmatic power, posterior keratometry, minimum pachymetry, central corneal thickness, anterior/posterior best fit sphere, maximum anterior/posterior elevation was significantly different between two consecutive Orbscan II measurements. Pentacam HR produced a better reproducibility in keratoconic corneas. The correlation coefficients were higher amongst Pentacam HR readings.
Both devices showed a good intraobserver correlation. However, Pentacam HR showed better reproducibility especially in elevation and pachymetric values when compared to that of Orbscan II.
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