title: World blindness--a challenge to all doctors.
authors: A
authors: A
authors: Foster
mesh_terms: D000368:Aged; D001766:Blindness / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D002648:Child; D002675:Child, Preschool; D014943:Global Health; D006801:Humans; D007231:Infant, Newborn; D008875:Middle Aged