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Göz Vakfı Bayrampaşa Göz Hastanesi, Glokom, İstanbul, Uz. Dr. Purpose: To investigate the effect of central corneal thickness (CCT) on Goldmann Applanation Tonometer (GAT) and Pascal Dinamic Contour Tonometer (PDCT) values.
Materials and Methods: In a prospective study,results of 324 eyes of 190 cases (109 women, 81 men) were analysed. CCT was measured by ultrasonic pachymeter; intraocular pressure (IOP) was measured by GAT and PDCT. Cases were divided in three groups according to CCT values; patients with CCT>570 μm. were included in first group, between 521-569 μm. in second group and CCT<520 μm. in third group. Collected data was analysed statistically by using Statistical Package for Social Sciences (SPSS) program.
Results: Mean age of the patients was 55.48±17.15. Mean CCT of the patients were found 590.88±14.92 μm. in first group, 544.74±14.03 μm. in second group and 487.58±33.06 μm. in third group. Mean IOP values measured with GAT and PDCT were 17.50±3.53 and 20.18±3.91 in first group; 16.70±3.56 and 19.90±3.44 in second group; 14.08±3.43 and 17.87±3.28 in third group, respectively. The IOP measurements obtained with PDCT were significantly higher than the ones with GAT (p<0.0001). There were positive correlations between the measurements of GAT and PDCT with CCT.
Conclusion: The IOP measurements obtained by PDCT were higher than GAT. In thinner corneas, IOP values were decreased both in PDCT and GAT. Besides, as the CCT values decreased, the difference between two measurements were increased. The measuremants with PDCT were more reliable in thinner corneas. Keywords : Central corneal thickness, Goldmann applanation tonometer, pascal dinamic contour tonometer