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Jose M. Martinez de la Casa, Javier Moreno-Montanes, Sr., Laura Morales-Fernandez, Elisa De Nova, Cristina Saenz, Julian Garcia-Feijoo; Clinical comparison of Icare-One self-tonometer, Icare-Pro and Goldmann applanation tonometer. Invest. Ophthalmol. Vis. Sci. 2012;53(14):5030. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To examine the ease of use of the new rebound tonometer Icare-ONE for measuring intraocular pressure (IOP) and to compare its readings to those provided by the rebound tonometer Icare-PRO and Goldmann applanation tonometer (GAT).
150 patients were included in this study. 82 were healthy controls and 68 have a diagnosis of glaucoma/ocular hypertension. Three measurements were made using Icare-ONE by trained patients themselves and 1 measurement were performed using Icare-PRO by a glaucoma specialist. The order of use of the tonometers was randomized. Clinical data were collected to analyze the difficulty of the technique.
Mean IOP was 16.8+/-5.2, 16.9+/-5.0 and 16.8+/-5.1 mmHg for each measurement with Icare-One, 16.4+/-3.5 with Icare-Pro and 16.3+/-3.7 mmHg with GAT. Statistical differences were not found between the average of IOP measurements taken with Icare-ONE and Icare-PRO tonometers (p=0.30), although Icare-One shows a tendency to overestimate at higher values and to underestimate at the lower values of IOP compared with Icare-PRO (β=0.624, p<0.001). Similar results were found when compare Icare-One with GAT (β=0.563, p<0.001). Excellent agreement were found between Icare-PRO and GAT (mean IOP difference 0.1 mmHg, p=0.614; β=0.150, p=0.157). An influence of age, diagnosis, number of medications used and education level was found on the difficulty of use of Icare-One.
Icare-ONE may be considered as a useful option for the monitoring of IOP, and can be used for most of the patients after a short training. Icare-PRO shows an excellent agreement with GAT.
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