Prevalence, Causes, and Risk Factors of Presenting Visual Impairment and Presenting Blindness in Adults Presenting to an Examination Center in Suzhou, China
Table 3
Causes for bilateral presenting visual impairment according to WTO and US definitions stratified by age.
Principal cause
WTO definition
US definition
18–39
40–59
60+
Total
18–39
40–59
60+
Total
No. (%)
No. (%)
No. (%)
No. (%)
No. (%)
No. (%)
No. (%)
No. (%)
Uncorrected refractive error
212 (99.07)
147 (61.51)
2 (0.82)
361 (51.79)
822 (99.28)
594 (64.85)
2 (0.24)
1418 (55.73)
Cataract
0
8 (3.35)
198 (81.15)
206 (29.56)
0
10 (1.09)
666 (81.52)
676 (26.4)
Age-related macular degeneration
0
10 (4.18)
16 (6.56)
26 (3.73)
0
29 (3.17)
56 (6.85)
85 (3.32)
Myopic retinopathy
1 (0.47)
13 (5.44)
4 (1.64)
18 (2.58)
2 (0.24)
38 (4.15)
14 (1.71)
54 (2.11)
Diabetic retinopathy
0
7 (2.93)
5 (2.05)
12 (1.72)
0
24 (2.62)
10 (1.22)
34 (1.33)
Posterior capsular opacification
0
0
6 (2.46)
6 (0.86)
1 (0.12)
2 (0.22)
23 (2.82)
26 (1.02)
Glaucoma
0
2 (0.84)
4 (1.64)
6 (0.86)
0
11 (1.20)
9 (1.10)
20 (0.78)
Pterygium
0
3 (1.26)
1 (0.41)
4 (0.57)
1 (0.12)
13 (1.42)
5 (0.61)
19 (0.74)
Cornea disorders
0
1 (0.42)
4 (1.64)
5 (0.72)
0
4 (0.44)
7 (0.86)
11 (0.43)
Others
1 (0.47)
12 (5.02)
0
13 (1.87)
2 (0.24)
15 (1.64)
1 (0.12)
18 (0.70)
Undetermined
0
36 (15.06)
4 (1.64)
40 (5.74)
0
176 (19.21)
24 (2.94)
200 (7.81)
Total
214 (100)
239 (100)
244 (100)
697 (100)
828 (100)
916 (100)
817 (100)
2561 (100)
WTO: World Health Organization; US: United States.
