Summary of representative studies of SBVS in LMICs
| Study | Country | Publication year | Age (years) | Sample size (n) | VI threshold | Prevalence of VI (%) | Prevalence of refractive errors (%) |
| Megbelayin and Asana31 | Nigeria | 2013 | 9–21 | 1175 | ≤6/9 | 6.9 | 51 |
| Kumah et al32 | Ghana | 2013 | 12–15 | 2435 | ≤6/12 | 3.7 | 71.7 |
| Naidoo et al33 | South Africa | 2003 | 5–15 | 4890 | ≤6/12 | 1.4 | 63.6 |
| Murthy et al34 | India | 2002 | 5–15 | 6447 | ≤6/12 | 6.4 | 81.7 |
| Paudel et al35 | Vietnam | 2014 | 12–15 | 2238 | ≤6/12 | 19.4 | 92.7 |
| Hashim et al36 | Malaysia | 2008 | 6–12 | 712 | ≤6/12 | 7.7 | 90.7 |
| Salomao et al37 | Brazil | 2018 | 11–14 | 2441 | ≤6/12 | 4.8 | 76.8 |
| Sauer et al38 | Peru | 2016 | 5–18 | 380 | ≤6/9 | 8.9 | Not reported |
| Current study | Armenia | 2021 | 6–15 | 5934 | ≤6/12 | 9.7 | 86.8 |
LMICs, low-income and middle-income countries; SBVS, school-based vision screening; VI, vision impairment.