Table 2.

Principal cause of blindness, SVI, MVI, and EVI in persons (PVA)

Eye disease/categories	Blindness		Severe VI		Moderate VI		Early VI
	n	%	n	%	n	%	n	%
Refractive error	0	0.0	1	0.9	77	13.2	385	71.4
Aphakia uncorrected	1	1.4	0	0.0	1	0.2	1	0.2
Cataract untreated	51	72.9	101	92.7	460	78.6	130	24.1
Cataract surgical complications	5	7.1	3	2.8	35	6.0	21	3.9
Trachomatous corneal opacity	0	0.0	0	0.0	0	0.0	1	0.2
Nontrachomatous corneal opacity	3	4.3	2	1.8	1	0.2	0	0.0
Phthisis	1	1.4	0	0.0	0	0.0	0	0.0
Glaucoma	1	1.4	0	0.0	0	0.0	0	0.0
Diabetic retinopathy	1	1.4	0	0.0	1	0.2	0	0.0
ARMD	0	0.0	1	0.9	2	0.3	0	0.0
Other posterior segment disease	5	7.1	1	0.9	6	1.0	1	0.2
All other globe/CNS abnormalities	2	2.9	0	0.0	2	0.3	0	0.0
Total	70	100.0	109	100.0	585	100.0	539	100.0

VI=Visual impairment; SVI=Severe VI; MVI=Moderate VI; EVI=Early VI; ARMD=Age-related macular degeneration; DR=Diabetic retinopathy; CNS=Central nervous system