Deniz ALTINBAY, Veli Nusret ÖZDEMİR
Turkish Journal of Clinical and Experimental Ophthalmology - 2025;20(4):265-272
Purpose: To compare intraocular pressure (IOP) measurements obtained using the Goldmann applanation tonometer (GAT), non-contact tonometry (NCT), Tono-Pen (TPT) and Pascal dynamic contour tonometry (DCT). Methods: Fifty-eight eyes of 29 patients were included in the study. IOP measurements obtained with GAT were compared with those measured using NCT, TPT, and DCT in eyes with thin and thick corneas. Results: The overall intraclass correlation coefficient (ICC) among the tonometers was 0.844. No statistically significant difference was observed between GAT and TPT measurements (P = 0.999). In contrast, DCT-IOP and NCT-IOP values were significantly higher than both GAT-IOP and TPT-IOP values (P < 0.001 for all comparisons). Bland-Altman analysis showed wide limits of agreement (LoA) between GAT and the other tonometers. At normal corneal thickness, a significant positive correlation was observed between central corneal thickness (CCT) and IOP measurements obtained with all tonometers. Conclusıon: Although significant correlations were observed among different tonometry methods, clinically relevant differences in IOP measurements were noted between devices. These findings suggest that correlation does not necessarily indicate agreement, and IOP values obtained with different tonometers should be interpreted cautiously, considering corneal-related factors and measurement principles.
