Material and methods: One hundred forty one eyes of 74 patients were included in the study. IOP measurements of all patients were performed with the Nidek NT 510 NCT. Corneal hysteresis (CH), corneal resistance factor (CRF), corneal-compensated IOP (IOPcc) and Goldmann-correlated IOP (IOPg) were measured with the ORA.

Results: The mean age was 11.39±3.18 years. The mean central corneal thickness (CCT) was 547.51±36.95 ?m. The mean IOP, IOPcc and IOPg were 17.96±3.29 mm Hg, 17.06±4.14 mm Hg, and 17.72±4.03 mm Hg respectively. The mean CH and CRF were 11.16±2.18, 11.73± 2.25 respectively. There was no statistically signifi cant difference between IOP and IOPg (p= 0.564). IOPcc values were found to be lower than IOP and IOPg values (p=0.021 and p=0. 003, respectively). There was no difference between IOP, IOPcc and IOPg values in patients with CCT less than 540 ?m. There was no difference between IOP-IOPcc and IOP-IOPg values in patients with CCT between 540-580 ?m. IOPg value was higher than IOPcc (p=0.008). IOP and IOPg values were higher than IOPcc in patients with CCT greater than 580 ?m (p=0.01, p=0.00, respectively).

Conclusion: There was no difference between IOP and IOPg with NCT and ORA devices when all patients were compared. In the low CCT group, there was no difference between IOPcc and IOP or IOPg. In the high CCT group, IOP and IOPg were higher than IOPcc. Keywords : Tonometer, pachymetry, ocular response analyzer