In Pakistan and India, the prevalence of refractive error blindness was :
0.20% of all age groups,
1.06% of age 40 and above. 5
In a Chinese population aged 50 and above, the prevalence of refractive error blindness was 0.59% (definition VAɞ/60). 5
In Nigeria, a survey of 1469 people aged 11-83 in two rural communities, the prevalence of refractive error blindness was 2.13%.
In the USA, age 40 and above, prevalence of refractive error blindness (definition of blindness as presenting VAɞ/60) was 0.33% among blacks, and 0.24% among whites. 6