Table 1. The prevalence of visual impairment, blindness and low vision in underserved rural of Iran by gender, location of rural, age and educational level.

	n (%)	Visual impairment	Blindness	Low vision
		% (95% CI)	% (95% CI)	% (95% CI)
Total	3095 (100)	6.43 (3.71–9.14)	1.18 (0.56–1.79)	5.25 (3.01–7.5)
Gender
Female	1747 (56.5)	6.34 (2.96–9.71)	1.2 (0.54–1.87)	5.13 (2.17–8.1)
Male	1348 (43.5)	6.55 (4.31–8.79)	1.14 (0.43–1.86)	5.41 (3.7–7.11)
Age (years)
≤5	53 (1.7)	0	0	0
6–20	747 (24.1)	0.75 (0.12–1.38)	0.19 (0.04–0.94)a	0.56 (0.15–2.09)a
21–30	433 (14)	2.26 (0.75–6.78)a	0	2.27 (0.75–6.87)a
31–40	481 (15.5)	2.04 (0.56–3.52)	0.29 (0.05–1.58)a	1.75 (0.62–4.93)a
41–50	507 (16.4)	2.76 (1.38–4.14)	0.55 (0.15–2.07)a	2.21 (0.81–3.61)
51–60	437 (14.1)	7.05 (4.19–9.92)	0.32 (0.06–1.68)a	6.73 (4.18–9.28)
61–70	213 (6.9)	20.39 (14.29–26.5)	1.97 (0.49–3.45)	18.42 (11.93–24.92)
>70	223 (7.2)	38.36 (30–46.73)	11.32 (4.98–17.67)	27.04 (19.63–34.46)
Education
Illiterate	937 (30.3)	15.84 (8.62–23.07)	3.14 (1.15–5.13)	12.71 (7.07–18.34)
Primary school	962 (31.1)	3.49 (1.65–5.34)	0.73 (0.24–1.22)	2.77 (1.16–4.37)
Guidance school	345 (11.1)	1.63 (0.5–2.75)	0	1.63 (0.5–2.75)
High school	607 (19.6)	1.15 (0.08–3.78)a	0	1.15 (0.37–2.68)a
College	244 (7.9)	1.72 (0.03–3.58)a	0	1.72 (0.06–3.51)a
Area
Southwest	1776 (57.4)	4.73 (3.39–6.08)	0.79 (0.18–1.4)	3.94 (2.5–5.39)
North	1318 (42.6)	8.71 (3.97–13.46)	1.7 (0.69–2.72)	7.01 (3.29–10.74)

Abbreviation: CI, confidence interval.

^aThe CI was calculated by binomial distribution.