<![CDATA[Introduction and objective: Intraocular pressure (IOP) measurement is important in diagnosis and management of glaucoma. Goldmann applanation tonometer (GAT) is regarded as the ’’gold standard’’ for measuring IOP. The non-contact tonometer (NCT) commonly used in ophthalmological practices and has potential advantages as the minimum risk of infection. This study was undertaken to compare IOP measured by GAT and NCT in different range of IOP. Methods: This was a cross sectional, observational analytic study wherein glaucoma patients visiting a hospital were included. IOP measurements were performed using GAT and NCT. Subjects were grouped into lower (<21 mmHg) IOP and higher (≥ 21 mmHg) IOP. The tonometer inter-method for IOP values were compared and analyzed. Results: IOP of 82 glaucomatous eyes were measured (46 eyes in the lower IOP group and 36 eyes in the higher IOP group). The mean of paired difference between GAT and NCT in the lower IOP group was 0.22±2.5 mmHg (p>0.05) and in the higher IOP group was 1.68±4.1 mmHg (p<0.05). The NCT underestimated GAT measurement in 67% eyes in higher IOP level group. Bland-Altman plot showed a good NCT-GAT agreement in the lower IOP group. Conclusion: Pressure readings of GAT and NCT was comparable in the subjects with lower IOP range ]]>
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