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Table 9 Prevalence of Glaucoma in some population-based studies for age ≥40 years

From: A Population-based survey of the prevalence and types of glaucoma in Nigeria: results from the Nigeria National Blindness and Visual Impairment Survey

Study population Examined (response rate %) Prevalence of glaucoma Undiagnosed glaucoma (%) Proportion blind (%) Reference
n All glaucoma % (95 % CI) 40–49 years age-specific
Nigeria, National 13,951 (90) 682 5.0 (4.6–5.5) 1.9 (1.6–2.3) 94 20 This study
Africa
 Kongwa, Tanzania 3247 (89) 135 4.2 (3.5–4.9) 1.7 (1.1–2.5) 98 14 [18]
 Hlabisa, South Africa 1005 (90) 41 4.5 (3.2–6.1) 1.2 (0.2–3.4) 90   [19]
 Temba, South Africa 839 (75) 55 5.3 (3.9–7.1) 1.1b 87   [20]
 Tema, Ghana 5603 (82) 32 6.5 (5.8–7.1) 3.2 (2.7–4.1) 97 3 [21]
 Akinyele, Nigeria 811 (90) 59 7.3 (5.5–9.1) 4.6 (2.1–7.1) 90 6 [22]
Asia
 Qatar 3149 (97) 67 1.7 (1.7–1.8) 1.45 b 51 6 [48]
 Yazd, Iran 1990 (86) 87 4.4 (3.3–5.4) 1.6 (0.8–2.4) 90   [46]
 Chinese, Singapore 1232 (72) 45 3.2 (2.3–4.1)a 1.1 (0.2–4.8) 62   [31]
 Chinese, Singapore 3353 (73) 134 3.2 (2.7–3.9)a 0.7 b 85 10 [38]
 Malay, Singapore 3280 (79) 150 3.4 (3.3–3.5)a 2.2 b 92 10 [36]
 Indian, Singapore 3400 (76) 78 1.9 (1.5–2.5)a 1.3 b 72 10 [35]
 Beijing, China 4439 (83) 158 3.7 (3.1–4.2) 2.2 (1.5–3.0) - 2 [37]
 Kailu, China 5197 (87) 169 2.9 (2.0–3.8)a 2.0 (1.3–2.7) 66 7 [32]
 Bhaktapur, Nepal 3991 (83) 75 1.8 (1.7–1.9)a 0.3 b 96 2 [33]
 Central India 4711 (80) 122 3.5 (2.8–4.1) 1.0 (0.5–1.6) 1 [34]
Australia
 Indigenous, Australia 1061 (64) 26 2.2 (1.6–3.6) 1.5 (0.4–2.5) 81 12 [47]
Europe
 Ponza, Italy 1034 (84) 39 3.8b 0 (0.0–1.7)   [42]
 Egna-Neumarkt, Italy 4297 (74) 121 2.9b approx 0.5 b   [41]
 Wroclaw, Poland 4853 (83) 79 1.6 (1.3–2.0) 0.4 (0.1–1.1) 71   [44]
  1. CI confidence interval
  2. aAdjusted rates
  3. b95 % confidence interval not reported
  4. – no data