Comparison of Icare Pro Tonometry and Icare One Tonometry Measurements in Healthy Eyes

Objectives:To compare intraocular pressure (IOP) measurements obtained with the Icare Pro tonometer used in clinical practice, and the Icare One self-tonometer.Materials and Methods:Fifty-two eyes of 52 healthy, right-handed individuals with no prior intraocular surgery or ocular trauma, structural ocular pathology, or systemic disease were evaluated. IOP was first measured using the Icare Pro tonometer. The participants were then told how to use the Icare One tonometer and asked to measure their own IOP. The results were analyzed statistically using SPSS v.24.Results:Of the 52 healthy participants, 16 (30.7%) were male and 36 (69.3%) were female. Their mean age was 31.6±6.3 (23-47) years. Mean IOP measured with the Icare Pro was 17.10±6.2 (11.5-25.2) mmHg, and the mean self-measured IOP with Icare One was 14.01±3.4 (7-24) mmHg. When the two methods were compared using Levene’s t test, there was a significant mean difference of -3.08±0.6 (95% confidence interval: -4.39 -1.78; p