Prevention of blindness. Prevalence and severity of trachoma.
D001766:Blindness / Q000453:epidemiology / Q000517:prevention & control*; D002648:Child; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D009018:Morocco / Q000453:epidemiology; D014141:Trachoma / Q000453:epidemiology* / Q000517:prevention & control