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【Purpose】Corvis ST (CST, Oculus Co.) is a tonometer that uses the Scheimpflug images for its intraocular pressure (IOP) measurement. The purpose of this study was to compare the IOP measurement in healthy eyes and repeatability among 3 devices: the CST, the noncontact tonometer (NCT; TX-F, Canon), and the Goldmann applanation tonometer (GAT). 【Subjects and Methods】The study included 20 eyes of 20 participants without any ocular diseases other than refractive error. The mean age was 35.0±12.9 years (range, 20-60 years). Subjectʼs IOP was measured five times each by the three devices. The average IOP, coefficient of variation (CV), and the intraclass correlation coefficient (ICC) were assessed and compared among the three devices. In addition, correlation coefficient was obtained for the measurements by each pair of the three devices. ANOVA with post-hoc Tukey-Kramer test was performed and a significant level < 0.05 was considered statistically significant. 【Results】The average (± standard deviation) IOP measurements by the CST, GAT, and NCT were 12.5±2.7 mmHg, 15.6±2.8 mmHg, and 13.6±2.6 mmHg, respectively. A significant difference was observed among all three devices (P < 0.01). The average CV (± standard deviation) for the CST, GAT, and NCT were 9.8±5.1%, 6.3±4.5%, and 8.7±3.6%, respectively. The CV for the CST was significantly higher than that for the GAT (P < 0.01). However, the CV for the NCT did not significantly differ from those for the CST and GAT (P > 0.05). The correlation coefficients were 0.865 (P < 0.0001) between the CST and NCT, 0.865 (P < 0.0001) between the CST and GAT, and 0.845 (P < 0.0001) between the NCT and GAT. The respective ICC values for the CST, NCT, and GAT were 0.792, 0.812, and 0.876. 【Conclusion】Although the IOP measurements by the CST highly correlated with the measurements by the NCT and GAT, the values appeared to be lower. This might be due to the difference in the measurement principle of the instrument. The repeatability of the CST was equivalent to that of the NCT.

Comparison of Intraocular Pressure Measurements Obtained by the Scheimpflug-based Tonometer, Non-contact Tonometer, and Goldmann Applanation Tonometer