We compared the intraocular pressures (IOPs) measured by the Corvis ST (CST), Goldmann applanation tonometer (GAT), and Rebound tonometer (RBT) and correlated the measured IOPs with the corneal center thickness (CCT). Methods

The IOPs were measured in 34 eyes of 34 normal subjects using the CST, GAT, and RBT by independent examiners. Comparisons between the IOPs measured by the CST and other tonometers were made using paired t -tests and Bland-Altman plots and Pearson's correlation coefficient was used to correlate the measured IOPs with the CCTs. Results

The IOP measured by the CST (C-IOP; 14.57 ± 2.37 mmHg) was significantly higher than that measured by the GAT(13.56 ± 2.25 mmHg) and RBT (13.57 ± 3.26 mmHg) ( p < 0.05). The biomechanically corrected C-IOP (C-bIOP; 13.40 ± 2.06mmHg) showed no difference from the GAT-IOP and RBT-IOP ( p > 0.50). In analyzing the correlation with CCT, RBT-IOP (R =0.34; p = 0.705) showed a lower correlation than the GAT-IOP (R = 0.49; p < 0.01) and C-IOP (R = 0.48; p < 0.01). The C-bIOP showed no correlation with the CCT ( p = 0.74). Conclusions

The IOP measurements using the C-IOP were significantly higher than the RBT-IOP and GAT-IOP but the C-bIOP showed no difference from the RBT-IOP and GAT-IOP. C-IOP, RBT-IOP, and GAT-IOP were significantly correlated with corneal thickness, but there was no correlation between CCT and C-bIOP. C-bIOP may therefore be considered clinically useful.