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

Table 3

Comparisons of the prevalence of VI or blindness with those in other minority population-based studies.

Location	Current study	Lhasa Eye Study	Xishuangbanna Eye Study	Dali Eye Study	Altay and Tacheng Eye Study	China Nine-Province Survey	China Nine-Province Survey
	Xinjiang	Tibet	Yunnan	Yunnan	Xinjiang	Luxi, Yunnan	Changji, Xinjiang
Year examined	2018	2010	2010	2010	2015	2006–2007	2006–2007
Setting	Rural	Urban and rural	Rural	Rural	Rural	Rural	Rural
Age range (years)	≥50	≥40	≥50	≥50	≥50	≥50	≥50
Ethnicity	Uygur	Zang	Dai	Bai	Han, Kazak, Uygur, and others	Han, Yi, Hui, Zhuang, Miao, Dai	32 ethnicities
Moderate VI	12.76%	10.41%	23.8%	24.82%	3.60%	11.96%	7.41%
Severe VI	2.94%		7.40%	8.13%	1.20%	3.88%	0.61%
Blindness	3.41%	8.43%			1.70%	5.40%	1.33%

∗Mild and moderate VI, <20/40 to >20/200; VI: visual impairment.