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¹Dokuz Eylül Üniversitesi Tıp Fakültesi, Göz Hastalıkları A.D., İzmir, Uzm. Dr.
²Dokuz Eylül Üniversitesi Tıp Fakültesi, Göz Hastalıkları A.D., İzmir, Prof. Dr. Purpose: To compare Pascal dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) in patients with primary open angle glaucoma (POAG) and ocular hypertension (OHT) and a control group, and to evaluate the effect of central corneal thickness (CCT) on measurements of intraocular pressure (IOP).
Materials and Methods: The IOP of 50 patients with POAG, 43 patients with OHT, and 50 subjects in the control group was measured with GAT and DCT. The CCT was measured by ultrasound pachimetry.
Results: GAT and DCT measurements were correlated in all groups. The measurements obtained with DCT were significantly higher than GAT measurements in the POAG and control groups. There was no significant difference between GAT and DCT in the OHT group. The difference between DCT and GAT was greater in patients with low IOP levels, whereas the difference was smaller in those with high IOP levels. The CCT in the group with OHT was significantly higher than that in the controls and patients with POAG. GAT and DCT were correlated with CCT but the correlation between GAT and CCT was higher than the correlation between DCT and CCT. The difference in IOP measurements between DCT and GAT was higher in patients in the POAG and control groups, which had lower CCT than the OHT group.
Conclusion: This study suggests that DCT is a reliable method for measuring intraocular pressure and is influenced by CCT less than GAT. Keywords : Pascal dynamic contour tonometry, Goldmann applanation tonometry, primary open angle glaucoma, ocular hypertension, central corneal thickness