Table 4

Proportion of decreased vision as a result of uncorrected refractive error

CountryYearType of surveyRaceAge groupDefinition% of decreased visual acuity due to uncorrected refractive error
Children
    Chile, La Florida441998Cluster random sampleHispanic5–15≤20/4055
    Colombia, Medellin45199320% random sample from 88 000 children screened all public schoolsHispanic5–14Not specified50
    USA, California461979–88First graders in a school district(>50% Hispanic)6–7≤20/4065
Adults
    Chile471990Community screening for blindnessHispanic≥;60≤20/20048
    Brazil,22 Sao Paulo1986–7Stratified random sampleHispanic≥;65≤20/2549
    Brazil,23 Capinas1986–7Community basedHispanic≥;50≤20/20034
    Brazil,24 Porto Alegre1992–4Community screening for blindnessHispanicAll ages≤20/20044
    Peru,23 Chimbote1986–7Community basedHispanic≥;40≤20/20015
    USA Baltimore, MD291985–8Stratified random sampleWhite≥;40≤20/20021
Black≥;40≤20/20018
    USA, Salisbury, MD341994–5Community based random sampleWhite65–84<20/4034
Black65–84<20/4023
    USA, Tucson and Nogales, AZ351997–9Community based random sampleHispanic≥;40<20/4073