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Abstract #19611 Published in IGR 9-3
Dynamic contour tonometry (DCT) versus Goldmann applanation tonometry (GAT) - a comparison of agreement and reproducibility
Herdener S; Pache M; Lautebach S; Funk JGraefe's Archive for Clinical and Experimental Ophthalmology 2007; 245: 1027-1030
BACKGROUND: The PASCAL® dynamic contour tonometer (DCT) is a novel device designed for intraocular pressure (IOP) measurements. It is assumed to be largely independent of corneal properties. In a previous study we compared DCT with Goldmann applanation tonometry (GAT) in 100 right eyes with normal corneas. The aim of the present study is to evaluate whether differences DCT-GAT ≥ 2.0 mmHg found in the previous study are reproducible and also present in the fellow eye. METHODS: Twenty-three of the 100 patients (M:F = 8:15, mean age: 36 ± 11 SD, range 22-53 years) with a previous difference DCT-GAT ≥ 2.0 mmHg were included in the present study. The minimum interval between the initial and the current examination was 3 weeks. The IOP-values of the fellow eyes in this subgroup were assessed in parallel. RESULTS: The difference DCT-GAT was 2.44 ± 0.4 SEM mmHg in the subgroup of the 23 right eyes and 2.03 ± 0.5 SEM mmHg for the fellow eyes, compared to 0.94 ± 0.5 SEM mmHg in the initial sample of 100 eyes. CONCLUSIONS: In cases with higher difference between DCT-GAT, the difference is reproducible and even present in the fellow eye. We, therefore, assume that the differences are not caused by chance, but by differing biomechanical corneal properties.
Dr. S. Herdener, Department of Ophthalmology, University of Freiburg, Killianstrasse 5, 79106, Freiburg, Germany, sonja.herdener@uniklinik-freiburg.de
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)