Prevalence of visual impairment among adults in China: the Beijing Eye Study.
OBJECTIVE
To estimate the prevalence and distribution of blindness and low vision in Northern China.


METHODS
Population-based cohort study.


METHODS
The Beijing Eye Study included 4438 subjects with an age of 40+ years. Mean age was 56.2 +/- 10.6 years (range, 40 to 101 years).


RESULTS
Forty-three (1.0%) individuals had low vision (<20/60 and >/=20/400 best-corrected vision), and 17 (0.4%) individuals were blind (best-corrected visual acuity in the better-seeing eye <20/400). Low vision/blindness were significantly associated with age (P < .001), myopic refractive error (P < .001), and level of educational background (P = .035). It was not associated with gender (P = .76) and rural vs urban area (P = .88).


CONCLUSIONS
Blindness or low vision affects approximately one in 100 Chinese older than 40 years. An estimated 4.1 million Chinese older than 40 years have low vision, and an estimated 1.6 million Chinese older than 40 years are blind.
Xu
Liang
L
Department of Ophthalmology and Eye Hospital, Tongren Hospital, Beijing, China.
Cui
Tongtong
T
Yang
Hua
H
Hu
Ailian
A
Ma
Ke
K
Zheng
Yuanyuan
Y
Sun
Baochen
B
Li
Jianjun
J
Fan
Guizhi
G
Jonas
Jost B
JB
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001766:Blindness / Q000453:epidemiology*; D002681:China / Q000453:epidemiology; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D015354:Vision, Low / Q000453:epidemiology*; D014792:Visual Acuity; D019987:Persons with Visual Disabilities / Q000706:statistics & numerical data*