Prevalence, Causes, and Risk Factors of Presenting Visual Impairment and Presenting Blindness in Adults Presenting to an Examination Center in Suzhou, China

Table 1

Prevalence of presenting visual impairment and presenting blindness (World Health Organization definition) stratified by age and gender.

Group (y)	No. of subjects	Bilateral				Monocular
		Visual impairment		Blindness		Visual impairment		Blindness
		No.	% (95% CI)	No.	%	No.	% (95% CI)	No.	% (95% CI)
Male
18–29	3250	27	0.83 (0.79–0.87)	0	0	73	2.25 (2.14–2.36)	2	0.06 (0.06–0.06)
30–39	6924	36	0.52 (0.49–0.55)	0	0	139	2.01 (1.91–2.11)	2	0.03 (0.03–0.03)
40–49	5535	46	0.83 (0.79–0.87)	0	0	133	2.40 (2.28–2.52)	5	0.09 (0.09–0.09)
50–59	5365	56	1.04 (0.99–1.09)	0	0	194	3.62 (3.44–3.80)	11	0.21 (0.20–0.22)
60–69	1730	23	1.33 (1.26–1.40)	0	0	105	6.07 (5.77–6.37)	10	0.58 (0.55–0.61)
70+	1335	102	7.64 (7.26–8.02)	0	0	126	9.44 (8.97–9.91)	28	2.1 (2.0–2.21)
Total	24139	290	1.20 (1.14–1.26)	0	0	770	3.19 (3.03–3.35)	58	0.24 (0.23–0.25)
Female
18–29	3604	62	1.72 (1.63–1.81)	0	0	150	4.16 (3.95–4.37)	0	0
30–39	6623	89	1.34 (1.27–1.41)	0	0	211	3.19 (3.03–3.35)	2	0.03 (0.03–0.03)
40–49	4347	73	1.68 (1.60–1.76)	0	0	150	3.45 (3.28–3.62)	3	0.07 (0.07–0.07)
50–59	3004	64	2.13 (2.02–2.24)	0	0	119	3.96 (3.76–4.16)	9	0.3 (0.29–0.32)
60–69	1385	41	2.96 (2.81–3.11)	0	0	113	8.16 (7.75–8.57)	3	0.22 (0.21–0.23)
70+	825	78	9.45 (8.98–9.92)	1	0.12	189	22.91 (21.76–24.06)	9	1.09 (1.04–1.14)
Total	19788	407	2.06 (1.96–2.16)	1	0.005	932	4.71 (4.47–4.95)	26	0.13 (0.12–0.14)
Combined
18–29	6854	89	1.30 (1.24–1.37)	0	0	223	3.25 (3.09–3.41)	2	0.03 (0.03–0.03)
30–39	13547	125	0.92 (0.87–0.97)	0	0	350	2.58 (2.45–2.71)	4	0.03 (0.03–0.03)
40–49	9882	119	1.20 (1.14–1.26)	0	0	283	2.86 (2.72–3.00)	8	0.08 (0.08–0.08)
50–59	8369	120	1.43 (1.36–1.50)	0	0	313	3.74 (3.55–3.93)	20	0.24 (0.23–0.25)
60–69	3115	64	2.05 (1.95–2.15)	0	0	218	7.00 (6.65–7.35)	13	0.42 (0.40–0.44)
70+	2160	180	8.33 (7.91–8.75)	1	0.05	315	14.58 (13.85–15.31)	37	1.71 (1.62–1.80)
Total	43927	697	1.59 (1.51–1.67)	1	0.002	1702	3.87 (3.68–4.06)	84	0.19 (0.18–0.20)