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Compare and study intraocular pressure measured by noncontact tonometer and contact tonometer (Goldmann's applanation tonometer and schiotz) and their correlation with central corneal thickness

Background: To compare the intraocular pressure (IOP) measurements with Non Contact Tonometry (NCT) and Goldman Applanation tonometry (GAT) and to compare NCT IOP and GAT IOP and Schiotz IOP among various central corneal thickness (CCT) group. Aims: To compare the intraocular pressure (IOP) measurements with Non Contact Tonometry (NCT) and Goldman Applanation tonometry (GAT) and to compare NCT IOP and GAT IOP and Schiotz IOP among various central corneal thickness (CCT) groups. Settings and Design: This was a cross sectional, observational study. 120 patients were sequentially collected after taking inclusion and exclusion criteria into consideration. Methods and Material: IOP measurements were done by NCT and then by GAT followed by Schiotz. Them followed by CCT. All IOP readings were taken in the sitting position over fifteen minutes. 120 patients were included in this study. Statistical analysis used: Statistical analysis was done by using descriptive and inferential statistics using Pearson's Correlation Coefficient and software used in the analysis was SPSS 24.0 version and p<0.05 is considered as level of significance Results: The IOP measured with both GAT and NCT showed no significant change with increasing CCT. The difference between the means increases with increasing CCT upto 600 microns. At lower IOPs ≤ 20 mm Hg, GAT measures are higher than NCT and this relationship is reversed at high IOPs. Conclusions: Both the tonometers showed a significant correlation with the gold standard technique (Goldman's applanation tonometer) over a range of IOP and CCT with the Schiotz tonometer better than the NCT.