Correlation of Central Corneal Thickness with Schiotz and Goldmann Tonometry
Purpose: To investigate the correlation between central corneal thickness (CCT) and intraocular pressure (IOP) measured by Schiotz and Goldmann tonometers.
Methods: CCT and IOP were determined by ultrasonic pachymetry and with the Goldmann and Schiotz tonometers, respectively. The correlation between IOP measured by Goldmann and Schiotz tonometers on one hand and CCT on the other, was determined by regression analysis.
Results: Overall, 168 eyes of 168 glaucoma patients including 85 male (50.6%) and 83 female (49.4%) subjects with mean age of 54.6±19.8 (range 7-85) years were evaluated. Mean CCT was 547.6±53.02 (range: 446-848) μm without any significant difference between men and women (P=0.811). IOP was correlated with CCT with both types of tonometry: every 20 μm change in CCT was associated with 1.9±1.4 mmHg and 1.54±0.95 mmHg change in IOP as measured by the Goldmann and Schiotz tonometers respectively with no statistically significant difference between the two devices (P=0.6).
Conclusion: IOP measurement by Schiotz tonometry is affected by CCT to the same extent as Goldmann applanation tonometry.
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