Onchocerciasis and trachoma

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Screening of asymptomatic persons is not recommended .
early detection of signs and symptoms is recommended .in 1976 , a WHO report on oncho-cerciasis recommended vector control rater than screening for this prevalent cause of blindness (WHO ,1976).a study in sierra leone has described a successful trial of school-based screening for onchocerciases by an ophthalmologist; however this would not be feasible in most developing countries (stilma et al 1983).primary prevention and early detection of persons with symptoms are also the strategies recommended in a publication on the prevention of blindness issued by WHO in 1984 (WHO ,1984).where services are accessible, teaching the public to practice self-referral for symptoms (early detection )is a useful adjunct to primary prevention in endemic  areas. 

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