Comparison of Goldmann tonometry, pneumotonometry and the effect of the central corneal thickness

Abstract Purpose To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT) and contact pneumotonometer (NTC), and to evaluate the effects of central corneal thickness (CCT) on the readings. Methods This was a prospective, observational clinical study, which included 96 eyes of 49 patients, 40 glaucomatous, 29 ocular hypertensive and 27 normal subjects. The IOP measurements were performed with each tonometer. The CCT was also measured. Results A strong correlation coefficient between GAT and the NTC was found (Pearson=0.922, p Conclusions The contact pneumotonometer is a reliable method in diagnosis and follow up of our population. The effect of the central corneal thickness was more important for the Goldmann applanation tonometer.