Vietnam, Dien Bien (2015)

Viet Nam, 2015
Dien Bien
Principal Investigator
Quynh Nga Pham
Trainer
Hans Limburg
Sample size
1999
Response rate
98.3%
RAAB version
RAAB6
Diabetic retinopathy
No
Disability module
No

Survey comparison

Vision impairment

Prevalence (age-sex adjusted)

Female
Male
Total
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Blind
1085
3.0
1.4 - 4.7
695
2.1
1.1 - 3.2
1779
2.6
1.5 - 3.7
Severe
891
2.5
0.8 - 4.2
326
1.0
0.0 - 2.0
1218
1.8
0.5 - 3.0
Moderate
1907
5.3
3.3 - 7.3
1374
4.2
2.4 - 6.1
3281
4.8
3.2 - 6.4
Mild
5131
14.3
11.5 - 17.1
4249
13.1
10.3 - 15.8
9380
13.7
11.5 - 16.0

Cataract

Cataract surgical coverage (CSC) (age-sex adjusted)

Female
Male
Total
%
95% CI
%
95% CI
%
95% CI
<3/60
-
39.7
25.2 - 54.1
-
50.3
32.0 - 32.0
-
43.8
31.9 - 55.7
<6/60
-
26.6
16.9 - 36.3
-
42.5
26.5 - 58.5
-
32.3
23.2 - 41.5
<6/18
-
24.7
16.2 - 33.1
-
39.0
24.4 - 53.6
-
29.7
22.1 - 37.2
<6/12
-
24.1
16.1 - 32.1
-
35.2
23.0 - 47.4
-
27.9
21.1 - 34.7

Effective cataract surgical coverage (eCSC) (age-sex adjusted)

Female
Male
Total
%
95% CI
%
95% CI
%
95% CI
<3/60
-
21.3
10.5 - 32.1
-
24.1
12.0 - 36.2
-
22.4
13.7 - 31.1
<6/60
-
13.6
6.4 - 20.8
-
20.1
10.2 - 30.0
-
16.0
9.6 - 22.3
<6/18
-
13.1
7.0 - 19.3
-
17.7
9.2 - 26.2
-
14.7
9.3 - 20.1
<6/12
-
12.3
6.6 - 18.0
-
15.0
7.6 - 22.5
-
13.2
8.3 - 18.2

Unmet need for cataract surgery: magnitude & prevalence (age-sex adjusted)

Female
Male
Total
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
<3/60
891
2.5
0.9 - 4.0
464
1.4
0.4 - 2.4
1355
2.0
1.0 - 3.0
<6/60
1695
4.7
2.3 - 7.1
745
2.3
0.8 - 3.8
2440
3.6
1.7 - 5.4
<6/18
2076
5.8
3.5 - 8.1
898
2.8
1.1 - 4.4
2974
4.3
2.5 - 6.2
<6/12
2518
7.0
4.7 - 9.4
1125
3.5
1.8 - 5.1
3643
5.3
3.5 - 7.1

Refractive error

Effective refractive error coverage (age-sex adjusted)

Female
Male
Total
%
95% CI
%
95% CI
%
95% CI
eREC
-
1.2
0.0 - 2.6
-
0.0
0.0 - 0.0
-
0.6
0.0 - 1.4
REC
-
1.8
0.0 - 4.1
-
2.2
0.0 - 5.1
-
2.0
0.2 - 3.8

eREC = effective refractive error coverage; REC = refractive error coverage

Vision impairing refractive error prevalence (age-sex adjusted)

Female
Male
Total
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Extrapolated magnitude
%
95% CI
Blind
0
0.0
0.0 - 0.0
0
0.0
0.0 - 0.0
0
0.0
0.0 - 0.0
Severe
0
0.0
0.0 - 0.0
0
0.0
0.0 - 0.0
0
0.0
0.0 - 0.0
Moderate
1193
3.3
1.7 - 4.9
1025
3.2
1.7 - 4.6
2217
3.2
1.9 - 4.6
Mild
4614
12.9
10.1 - 15.6
4052
12.5
9.7 - 15.2
8666
12.7
10.3 - 15.0

Vision impairing refractive error is defined as presenting VA less than 6/12 improving to 6/12 with pinhole. Use of presenting VA accounts for the prevalence of uncorrected or undercorrected refractive error only.

Notes

Vision impairment categories defined according to WHO thresholds using presenting visual acuity in the better eye.

All prevalence and coverage estimates are adjusted to the age and gender distribution of the population 50 years and older in the survey area.

All 95% confidence intervals adjusted to account for the cluster design of the survey.

Effective cataract surgical coverage (eCSC) and cataract surgical coverage (CSC) are calculated according to the 2022 definition; eCSC is only reported where 6/12 data available.

Refractive error results, including effective refractive error coverage (eREC), only reported where 6/12 data available. RAAB6 surveys measured presenting visual acuity (not uncorrected visual acuity) so the alternative calculation for eREC is used.