Agreement between the ICare HOME Tonometer and the Goldmann Applanation Tonometer in the Assessment of the Peak Intraocular Pressure in the Water-Drinking Test

Purpose: To investigate the agreement between the ICare HOME tonometer and the Goldmann Applanation Tonometer (GAT) in assessing the peak intraocular pressure (IOP) during the water-drinking test (WDT). Design: Prospective cross-sectional study. Subjects: Seventy-nine eyes of 41 open-angle glaucoma patients were included in the study. Methods: All of the included patients underwent a training session provided by ophthalmologist specialists to use the ICare HOME tonometer. Then the IOP was first measured with the GAT (AT900; Haag-Streit) by a trained physician, immediately followed by ICare HOME tonometer (TA022, ICare Oy) measurement by the patient. Four measurements were taken with each device with 15-minute differences as established by the WDT. Main Outcome Measures: The agreement and degree of correlation of the peak IOP by both tonometers were assessed. Results: The agreement between the ICare HOME and GAT was high during the WDT: the intraclass correlation coefficient (r) between the 2 methods from basal to 45 minutes: 0.94 (P < 0.001), at basal: 0.91 (P < 0.001), at 15 minutes: 0.94 (P < 0.001), at 30 minutes: 0.94 (P < 0.001), at 45 minutes: 0.95 (P < 0.001), and for peak IOP: 0.94 (P < 0.001). There was no significant difference between peak IOP with the GAT and ICare HOME (18.3 ± 4.6 [10–33] and 18.5 ± 5.0 [0–33], respectively, P = 0.533), nor between the delta of fluctuation between basal and peak IOP with the GAT and ICare HOME (3.96 ± 3.22 and 4.54 ± 3.92, P = 0.054). Conclusions: Our study demonstrated a high agreement between the ICare HOME and the GAT during the WDT in a clinical environment with supervision. Financial Disclosure(s): The authors have no proprietary or commercial interest in any materials discussed in this article.