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Abstract #21009 Published in IGR 10-2
Comparison of the Icare® rebound tonometer and the Goldmann applanation tonometer over a wide IOP range
Munkwitz S; Elkarmouty A; Hoffmann EM; Pfeiffer N; Thieme HGraefe's Archive for Clinical and Experimental Ophthalmology 2008; 246: 875-879
BACKGROUND: The aim of this study was to compare the intraocular pressure (IOP) results measured by the Icare® rebound tonometer with those obtained by the Goldmann applanation tonometer (GAT) over a wide range of IOP values. Furthermore, the comfort level of the Icare® measurement was evaluated. METHOD: The study included 75 eyes of 75 patients. The patients were divided into three groups (7-15 mmHg n = 25, 16-22 mmHg n = 25, 23-60 mmHg n = 25). The measurements were taken by two independent observers in a masked fashion. All patients were asked about discomfort during the Icare® measurement. To establish the agreement between the two devices, a Bland-Altman analysis was performed. RESULTS: Overall, the 95% confidence interval of the differences between the two devices was -8.67 to 10.25 mmHg and in 62.7%, the Icare® measurement was within ± 3 mmHg of the GAT measurements. The distribution of the differences in IOP was similar, from 7-22 mmHg. In the higher IOP range (23-60 mmHg), however, the deviation was almost twice as large. The measurement with the Icare® tonometer was well tolerated; 100% of the patients denied any discomfort. CONCLUSIONS: The Icare® tonometer is a mobile alternative to GAT in a low to moderate IOP range, but our findings show a greater deviation than previously reported. In high IOP values, measurements with the Icare® tonometer do not correlate well with GAT.
Dr. S. Munkwitz, Department of Ophthalmology, Johannes Gutenberg-University Mainz, Mainz, Germany
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
