Global scale of avoidable blindness.
D001766:Blindness / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D002386:Cataract / Q000150:complications*; D002648:Child; D003906:Developing Countries; D014943:Global Health; D006287:Health Planning Guidelines; D006295:Health Resources; D006801:Humans