Evaluating the Diagnostic Accuracy of the iCare Rebound Tonometer Compared to the Goldmann Applanation Tonometer

To compare the diagnostic accuracy of the iCare rebound tonometer and the Goldmann Applanation Tonometer (GAT).Patients and

A comparative assessment of intraocular pressure (IOP) was conducted on patients visiting the vision clinic at Torfeh Eye Hospital, Tehran, Iran, from May 2022 to August 2022. The IOP of both eyes of each patient was initially measured by one individual using the iCare tonometer device. Then, the patients were referred to the ophthalmology department, where the IOP of both eyes was measured using the GAT by an ophthalmologist who was unaware of the IOP results obtained with the iCare tonometer.

The mean age of the patients entering the study was 49 ± 17 years. The mean IOP measured with the GAT was 14.47 ± 5.92 mmHg with a range of 6 mmHg to 75 mmHg. With the iCare tonometer, it was 14.44 ± 6.42 mmHg, with a range of 6.1 mmHg to 80.7 mmHg, indicating no statistically significant difference between the two devices. There was a very strong correlation(r: 0.864; 95% confidence interval 0.732-0.983; P < 0.001) between the measurements by GAT and the iCare device. The correlation strength did not show a substantial difference between male(r: 0.885) and female (r: 0.816) patients. The correlation was strong among patients with low IOP (r: 0.631), normal IOP (r: 0.797), and high IOP (r: 0.781) eyes.

iCare tonometer IOP readings have acceptable correlation with GAT readings and can be considered a reliable alternative to GAT for measuring IOP by primary health providers.