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Abstract #18473 Published in IGR 3-3
Reproducibility of measurement of ocular pulse amplitude and intraocular pressure using Smartlens
Vogel A; Beck S; Schwenn O; Grus F; Krummenauer F; Pfeiffer NOphthalmologe 2001; 98: 944-949
BACKGROUND: SmartLens (ODC Ophthalmic Development Company AG, Zurich) is a contact lens tonometer that allows continuous registration of intraocular pressure (IOP) and ocular pulse amplitude (OPA) and simultaneous ophthalmoscopy. The purpose of this study was to evaluate the intra- and interobserver variability and reliability of IOP and OPA measurements using SmartLens. METHODS: To evaluate the intraobserver variability, IOP and OPA were both measured five times in ten healthy eyes by one observer. To evaluate the interobserver variability, IOP and OPA were measured by three different observers in ten healthy eyes. Data description is based on coefficients of variation (SD/mean in %), statistical inference on ANOVA-based reliability estimation. RESULTS: The coefficient of the intraobserver variation was 9.57% for IOP and 14.5% for OPA (SD IOP: ± 1.64 mmHg, SD OPA: ± 0.39 mmHg). The coefficient of the interobserver variation with five replicate measurements was 10.16% for IOP and 14% for OPA (SD IOP: ± 1.83 mmHg, SD OPA: ± 0.4 mmHg). The interobserver reliability was 87% for IOP and 86% for OPA. One of the three observers obtained significantly higher IOP and OPA values. CONCLUSIONS: SmartLens is a reasonably precise and reliable device for IOP as well as OPA measurements, but the results were not found to be observer-independent. LA: German
Dr A. Vogel, Universitäts-Augenklinik, Langenbeckstrasse 1, 55131 Mainz, Germany. Annette.Vogel@gmx.de
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
