Table 2: Results of color vision and stereoacuity testing in control, mild glaucoma and advanced glaucoma cases.

		Normal (50 cases)	Mild (31 cases)	Advanced (25 cases)	P value
Color vision tests	CUCV	50 normal	30 (96.8%) normal, one (3.2%) tritan,	17 (68%)normal, 8 (32%) tritan	P1 = 0.75 P2 = 0.06 P3 = 0.02^‡
	D15	50 normal	22 (70.97%) normal, 9 (29%) tritan	7(28%) normal, 18(72%) tritan	P1 = 0.08 P2 < 0.001^‡ P3 = 0.003^‡
	P = < 0.001† significant difference between the two test CUCV and D15
Lang test for stereoacuity	200 sec. of arc Yes: No	50 (100%):0	15(48.4):16(51.6%)	5(20%):20(80%)	P1 = 0.001^‡ P2 < 0.001^‡ P3 = 0.03^‡
	400 sec. of arc Yes: No	50 (100%):0	16(51.6%):15 (48.4%)	6(24%):19 (76%)	P1 = 0.007 ^‡ P2 < 0.001^‡ P3 = 0.04
	550 sec. of arc Yes: No	50 (100%):0	19(61.3):12(38.7)	7(28%):18 (72%)	P1 = 0.03^‡ P2 < 0.001^‡ P3 = 0.014^‡
	600 sec. of arc Yes: No	50(100%):0	25(80.6%):6(19.4)	11(44%):14(56%)	P1 < 0.01 P2 = 0.003^‡ P3 = 0.005^‡
	1200 sec. of arc Yes: No	50 (100%)	26 (83.9%):5(16%)	14(56%):11(44%)	P1 = 0.006^‡ P2 = 0.007^‡ P3 = 0.023^‡
	Total lang test scoring	5	3.23 ± 1.91^‡	1.72 ± 1.90^‡	p1 = 0.001^‡ p2 = 0.001^‡ p3 = 0.006^‡

CUCV: City University Color Vision. D15 color test, L: Lang Test, C: Contrast Sensitivity, Yes: Could detect the shapes, No; could not detect the shapes.

Data expressed as mean ± SD, P1 difference between normal and mild, P2difference between normal and advanced, P3 difference between mild and advanced

^*P significant < 0.05, t test

†wilcoxon signed ranks

‡P significant Kruscalwalis test