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The Icare One Rebound Tonometer: A New Device For Self-tonometry

Department of Ophthalmolgy, University of Cologne, Cologne, Germany

Commercial Relationships: Stergiani Gaki, None; Kerstin S. Jablonski, None; Andre Rosentreter, None; Thomas S. Dietlein, None

Support: None

Clinical Trial: www.germanctr.de, DRKS00000478

Abstract

Purpose:To determine the feasibility of the new Icare ONE rebound tonometer (RTONE) in a normal population and to examine the agreement of this device with Goldmann applanation tonometer (GAT). Moreover, we wanted to evaluate the patients' contentment using this device.

Methods:52 eyes of healthy patients were included in this prospective study. Measurements were obtained by three equally skilled observers. Additionally, the patients measured thereself the IOP with the RTONE. Agreement between the tonometers was calculated using the Bland-Altman method. After self-tonometry with the Icare ONE tonometer patients' satisfaction was measured using a visual analog scale (range: 1 (excellent) - 5 (poor)) for different subitems.

Results:There was good correlation between IOP readings obtained using the RTONE and GAT, both, when measurement was conducted by the ophthalmologist (RTONE(o)) or by the patient (RTONE(p)) (r = 0.844, p < 0.001 ; r = 0.721, p < 0.001, respectively). RTONE(o) and RTONE(p) readings consistently were higher than GAT measurements (RTONE(o)-GAT mean difference: 0.81 ± 1.92 mmHg; RTONE(p)-GAT mean difference: 0.81 ± 2.41 mmHg). Operability of the device, sense of security, and comfort of measurement were rated by the patient using the visual analog scale as follows: 2.21 ± 1.23, 1.37 ± 0.48, 1.74 ± 0.55, respectively.

Conclusions:Measurements obtained with the RTONE by an ophthalmologist and the patient showed excellent correlation with those provided by applanation tonometry. Hereby, RTONE generally tends to overestimate the IOP compared to GAT. Our study revealed a good acceptance among patients using the Icare ONE tonometer.

Keywords: intraocular pressure • clinical (human) or epidemiologic studies: systems/equipment/techniques

© 2011, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.