2M.D., Gulhane Militar Medical Faculty, Sarikamis Military Hospital, Eye Clinic, Kars/TURKEY
3M.D. Asistant, Kafkas University Faculty of Medicine, Department of Ophthalmology, Kars/TURKEY
4M.D. Professor, Kafkas University Faculty of Medicine, Department of Ophthalmology, Kars/TURKEY Purpose: To compare intraocular pressure (IOP) measurements provided by the Goldmann Applanation Tonometer (GAT) and the iCare© rebound tonometer (RBT) in healthy adults and to assess the influence of central corneal thickness (CCT) on these measurements.
Materials and Methods: This prospective, randomized study includes 131 right eyes of 131 adult volunteers (63 females, 68 males) with no ocular pathology. All subjects' IOP readings were taken using the iCare RBT before they received topical anesthetic, and using the GAT after receiving topical proparacaine, with a 15-minute interval between readings.
Results: For the measurements taken with the iCare RBT and GAT, the mean corrected IOP values were 18.19±4.42 mmHg and 18.56±4.42 mmHg, respectively. The differences between corresponding measures (iCare RBT value vs. GAT value) had a mean of -0..37±2.89 mmHg, and a 95% confidence interval of -5.3 to 6.0 mmHg (p<0.001) according to the Bland-Altman scatter-plot. The iCare RBT has a sensitivity of 58.1% and a specificity of 84.1%. According to linear regression analysis, every change of 10μm in CCT level caused a 0.98 mmHg change in IOP measurements with the iCare RBT.
Conclusion: There is a reasonable level of correlation between the iCare RBT and GAT in healthy individuals. Because of the clinically reasonable correlation, sensitivity and higher specificity detected for the iCare RBT compared to the GAT, the iCare RBT is an adequate screening tool for healthy individuals. However, it should be considered that iCare RBT measurements are influenced by CCT, so its use should be combined with pacymetric evaluation.
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