Table 4 Presenting VA in the better eye (WHO classification).

WHO VA category (presenting VA in the better eye)	Definition (based on Snellen chart VA)	Subjects n (%)	Principal cause of reduced VA in better eye
Normal	x>6/12	36 (53.0)	—
Near normal	6/18⩽x<6/12	16 (23.5)	Diabetic retinopathy 50% (n = 8)
			Cataract 31.3% (n = 5)
			Not ascertained 12.5% (n = 2)
			Refractive error 6.3% (n = 1)
Moderate visual impairment	6/60⩽x<6/18	15 (22.0)	Diabetic retinopathy 53.3% (n = 8)
			Cataract 40% (n = 6)
			Axial pterygium 6.7%(n = 1)
Severe visual impairment	3/60⩽x<6/60	0	—
Blind	x<3/60	1 (1.5)	Cataract (n = 1)
Total		68 (100)

VA, visual acuity; WHO, World Health Organization