Prevalence, Risk Factors, and Causes of Visual Impairment in an Elderly Chinese Uygur Population in Southern Xinjiang

Table 5

Causes of low vision and blindness.

Major causes	Low vision (n = 230)	Blindness (n = 50)
Cataract	98 (42.6%)	17 (34%)
Glaucoma	29 (12.6%)	11 (22%)
Highly myopic retinopathy	5 (2.2%)	2 (4%)
Age-related macular degeneration	9 (3.9%)	3 (6%)
Refractive error	45 (19.6%)	3 (6%)
Optic atrophy	4 (1.7%)	2 (4%)
Retinitis pigmentosa	3 (1.3%)	5 (10%)
Amblyopia	5 (2.2%)
Pterygium	9 (3.9%)
Retinal venous occlusion	3 (1.3%)
Others	10 (4.3%)	6 (12%)
Undetermined	10 (4.3%)	1 (2%)

Low vision = PVA worse than 20/63 but better than 20/400 in the better eye. Blindness = PVA worse than 20/400 in the better eye.