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.