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¹M.D., Çanakkale State Hospital, Eye Clinic, Çanakkale/TURKEY
²M.D., Civril State Hospital, Eye Clinic, Civril-Denizli/TURKEY
³M.D., Van Trainig and Research Hospital, Eye Clinic, Van/TURKEY
⁴M.D. Asistant Professor, 100. Yıl University Faculty of Medicine, Department of Ophthalmology, Van/TURKEY
⁵M.D. Professor, 100. Yıl University Faculty of Medicine, Department of Ophthalmology, Van/TURKEY Purpose: To compare the correlate of intraocular pressure (IOP) measurements obtained using Goldmann applanation tonometer (GAT), Pascal Dynamic Contour Tonometer (DCT) and Tono-pen (TP) and to evaluate the influence of central corneal thickness (CCT) on IOP measurements in eyes with high intraocular pressure.
Material and Methods: Thirty eight right eyes of 38 patients with high IOP were recruited in the study. After central corneal thickness (CCT) was measured in all eyes with ultrasonic pachymetry, IOP was measured with GAT, DCT and TP. Corrected GAT (CGAT) value was calculate according to the formula upon suggestion of Doughty and Zaman. Correlations between IOP measurements from these tonometers and CCT values were statistically analyzed.
Results: Mean IOP was 34.6±10.9, 33.5±10.4, 31.8±11.7 and 28.7±6.8 mmHg for CGAT, GAT, TP and DCT respectively. There was a strong correlation between GAT and TP in eyes with high IOP, while DCT wasn't consistency. A significant association between measured IOP and CCT was found with each instrument in eyes with thin corneas. No correlation was found with each instrument in eyes with thick corneas. As CCT decreased, correlation was high of all IOP instruments.
Conclusion: GAT and TP measurements were correlated in all groups. IOP measurement by all four methods is affected by CCT. IOP values obtained with GAT and TP were higher than with DCT. In conclusion, our study showed fair inter-method agreement between GAT and TP results, and poor agreement between GAT and DCT results in cases with high IOP. Keywords : Central corneal thickness, dynamic contour tonometry, goldmann applanation tonometry, High IOP, tonopen tonometry