Table 6 Prevalence of blindness and its causes reported from population based studies in china

Beijing, China

(Xu L et al.2006)

> = 40

0.3%

Cataract(38.5%); Cornea opacity (15.4%);Myopic macular degeneration(7.7%); Glaucoma(7.7%)

Handan china

(Liang YB et al. 2008)

> = 30

0.5%

Cataract (36.6%);Myopic macular degeneration (19.5%)

Glaucoma(7.3%);Cornea opacity(7.3%)

Taiwan, China

(Hsu WM, et al. 2004)

> = 65

0.59%

Cataract (41.7%);Myopic macular degeneration (12.5%)

AMD(10.4%)

Hongkong, China

(Michon JJ, et al. 2002)

> = 60

1.8%

Cataract (51.7%);Macular degeneration (27.1%)

Glaucoma(7.1%)

Hebei, China

(Song XJ.1992)

0.19%

in urban areas

Cataract(32.3%);trachoma complications(13.4%)

corneal disease(13.06%);glaucoma(9.97%)

Shanxi, China

(Zhang JX.1990)

0.18%

in cities

Cataract (29.7%)

Shangdong, china

(Yu XM.1992)

0.34%

Cataract, corneal diseases and glaucoma in urban areas

China

(Zhang SY.1992)

0.43%

Cataract(41.06%);Corneal disease(15,38%)

Trachoma (10.4%);Glaucoma (8.8%)

Chongqing, china

(Liu S, et al. 2007)

>50

1.8%

Cataract (17.9%);Retinal diseases (20.7%); refraction error(15.4%);

cornea disease (11.6%); glaucoma (13.4%)

Shanghai

(Huang XB, et al. 2009)

0.95%

in 60-79 yrs

0.68%

in 70-79 yrs

0.40%yrs

in 80 yrs or older

Macular degeneration(28.57%);Cataract(27.27%); Corneal opacity (6.49%);

Retinal detachment (5.84%); Optical nerve atrophy (5.19%); Retinitis pigmentosa (5.19%)

Henan

(Li Y et al.2009)

0.09%

in urban

no noted

Hubei

(Chen W et al. 2009)

0.33%

in urban

Cataract (54.55%);Glaucoma(10.22%); Congenital abnormal (8.41%);Corneal disease(7.48%); Retinal and choroidal disease (6.54%)