Table 2.

Comparison of intraocular pressure (IOP) measured by goldmann applanation tonometry (GAT) and a tono-pen AVIA tonometer (Reichert technologies Inc., Depew, NY, USA) in a sitting position

	Mean ± SD	Range	p-value
IOPGAT (mmHg)	12.81 ± 2.11	6 ~ 18	0.673*
IOPAVIA (mmHg)	12.92 ± 1.71	6 ~ 19
Correlation
Pearson’s r	0.788		< 0.001
Linear regression r	0.752		< 0.001
Difference† (mmHg)	0.15 ± 1.09	-2 ~ 2
Linear regression r ‡	0.052		0.644

SD Standard deviation.

*Calculated by student's paired t-test.

^†IOP_GAT minus IOP_AVIA.

^‡Calculated by Altman-Bland's method.