Table 1. Clinical characteristics of normal subjects and normal-tension glaucoma patients.

	Normal	NTG	P value
Age (y)	64.9 ± 11.9	67.6 ± 11.5	0.41
Gender (M/F)	22/30	12/23	0.45
IOP (mm Hg)	14.9 ± 3.4	14.9 ± 3.7	0.94
Axial length (mm)	24.3 ± 1.7	24.7 ± 1.6	0.20
Central corneal thickness (μm)	526.2 ± 39.9	516.4 ± 29.7	0.23
Initial systemic blood pressure (mmHg)
Systolic	127.1 ± 15.8	131.3 ± 20.7	0.30
Diastolic	75.3 ± 11.0	76.5 ± 15.4	0.67
Ocular perfusion pressure (mmHg)	46.8 ± 7.1	48.2 ± 12.2	0.50
MD range (dB)		-32.71 ~ -2.08

NTG; normal-tension glaucoma, M; male, F; female, IOP; intraocular pressure

MD; mean deviation