April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
The Icare One Rebound Tonometer: A New Device For Self-tonometry
Author Affiliations & Notes
  • Stergiani Gaki
    Department of Ophthalmolgy, University of Cologne, Cologne, Germany
  • Kerstin S. Jablonski
    Department of Ophthalmolgy, University of Cologne, Cologne, Germany
  • Andre Rosentreter
    Department of Ophthalmolgy, University of Cologne, Cologne, Germany
  • Thomas S. Dietlein
    Department of Ophthalmolgy, University of Cologne, Cologne, Germany
  • Footnotes
    Commercial Relationships  Stergiani Gaki, None; Kerstin S. Jablonski, None; Andre Rosentreter, None; Thomas S. Dietlein, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 661. doi:
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      Stergiani Gaki, Kerstin S. Jablonski, Andre Rosentreter, Thomas S. Dietlein; The Icare One Rebound Tonometer: A New Device For Self-tonometry. Invest. Ophthalmol. Vis. Sci. 2011;52(14):661.

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      © ARVO (1962-2015); The Authors (2016-present)

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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.

Clinical Trial: : www.germanctr.de, DRKS00000478

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