Tuoketuo county

Male (n = 939)

Female (n = 1037)

Total (n = 1976)

n

%

95%CI

N

%

95%CI

n

%

95%CI

Blindness (pinhole correction)

All bilateral blindness (BCVA < 3/60)

8

0.9%

(0.3% - 1.4%)

16

1.5%

(0.8% - 2.3%)

24

1.2%

(0.7% - 1.7%)

All blind eyes

56

3.0%

(1.9% - 4.1%)

85

4.1%

(2.9% - 5.3%)

141

3.6%

(2.8% - 4.4%)

Severe visual impairment (SVI)

All bilateral SVI (BCVA<6/6/60, ≥3/60)

9

1.0%

(0.3% - 1.6%)

11

1.1%

(0.4% - 1.7%)

20

1.0%

(0.6% - 1.5%)

All SVI eyes

27

1.4%

(0.7%- 2.2%)

39

1.9%

(1.1% - 2.7%)

66

1.7%

(1.1% - 2.2%)

Moderate VI (pinhole)

All bilateral MVI (VA < 6/18, ≥6/60)

34

3.6%

(2.4% - 4.8%)

53

5.1%

(3.8% - 6.5%)

87

4.4%

(3.5% - 5.3%)

All MVI eyes

93

5.0%

(3.6% - 6.3%)

129

6.2%

(4.8% - 7.7%)

222

5.6%

(4.6% - 6.6%)

Shangdu county

Male (n = 980)

Female (n = 995)

Total (n = 1975)

Blindness (pinhole correction)

All bilateral blindness (BCVA < 3/60)

9

0.9%

(0.3% - 1.5%)

19

1.9%

(1.1% - 2.8%)

28

1.4%

(1.0% - 1.9%)

All blind eyes

58

3.0%

(1.9% - 4.0%)

90

4.5%

(3.2% - 5.8%)

148

3.7%

(2.9% - 4.6%)

Severe visual impairment (SVI)

All bilateral SVI (PVA < 6/6/60, ≥3/60)

16

1.6%

(0.8% - 2.4%)

24

2.4%

(1.5% - 3.4%)

40

2.0%

(1.4% - 3.4%)

All SVI eyes

40

2.0%

(1.2% - 2.9%)

49

2.5%

(1.5% - 3.4%)

89

2.3%

(1.6% - 2.9%)

Moderate VI (pinhole)

All bilateral MVI (VA < 6/18, ≥6/60)

36

3.7%

(2.5% - 4.9%)

55

5.5%

(3.1% - 7.0%)

91

4.6%

(3.7% - 5.5%)

All VI eyes

97

4.9%

(3.6% - 6.3%)

129

6.5%

(5.0% - 8.0%)

226

5.7%

(4.7% - 6.7%)