Anila Farid, Memoona Arshad, Nimra Gul, Shabana Chaudhary, Muhammad Zubair Nazar.
Accuracy of Icare Rebound Tonometer and its Comparison with Goldman Applanation Tonometer.
Pak J Ophthalmol Jan ;40(1):28-33.

Purpose: To determine accuracy of iCare rebound tonometer (IRT) in terms of agreement with Goldman Applanation Tonometer (GAT) and effect of Central corneal thickness (CCT) on its accuracy. Study Design: Comparative cross sectional study. Place and Duration of Study: Ophthalmology Department of Ittefaq Hospital Lahore from September 2022 to May 2023. Methods: Participants of the study were recruited through non-probability convenient sampling. With Icare PRO rebound tonometer (IRT), two consecutive sets of measurements with 6 measurements for each set were made, and the averaged values were used for the statistical analyses. After 5 minutes GAT measurement was taken for intraocular pressure (IOP). CCT was measured by ultrasound pachymetry from mean of 2 measurements noted. Data was analyzed by Bland-Altman plots for determining agreement of GAT-IOP and IRT-IOP. Pearson correlation coefficient determined the correlation of GAT-IOP and IRT-IOP with CCT. Results: Out of 200 participants there were 76 (38%) males and 124 (62%) females. Mean age of participants was 27.84 +- 6.1 years. Mean IOP with IRT was 16.24 +- 2.02 (range 12.1 - 20.3 mmHg). Mean IOP with GAT was 14.40 +- 1.98 (range 11.00 - 19 mmHg). Mean IOP with adjusted CCT using GAT was 14.40 +- 1.64 (range 11 - 18 mmHg). Mean CCT was 544.81 +- 42.04 (range 615 - 471 um). Mean IOP-GAT & IOP-IRT with adjusted CCT showed normal distribution. Mean difference of IOP-GAT and IOP-IRT with t test was 1.83 +- 1.12 (p = .079). Conclusion: There is a strong agreement between IOP-GAT and IOP-IRT. CCT had a strong impact on IOP measurements with both tonometers. However, CCT affected IOP reading of GAT more than IRT.

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