Prevention of blindness. Prevalence and causes of blindness and low vision.
D000293:Adolescent; D000367:Age Factors; D001541:Benin / Q000453:epidemiology; D001766:Blindness / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D016000:Cluster Analysis; D006801:Humans; D008875:Middle Aged; D012423:Rural Health; D012737:Sex Factors; D015354:Vision, Low / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*