The Nigeria National Blindness and Visual Impairment Survey
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The Nigeria National Blindness and Visual Impairment Survey
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ORIGINAL ARTICLES Ecological determinants of blindness in Nigeria: The Nigeria National Blindness and Visual Impairment Survey M M Rabiu, Murthy V S Gudlavalleti, C E Gilbert, Selvaraj Sivasubramaniam, Fatima Kyari, Tafida Abubakar, on behalf of the Nigeria National Blindness and Visual Impairment Study Group
Objective. To determine the prevalence and causes of visual loss in different ecological zones across Nigeria. Methods. A population-based survey using multi-stage, stratified, cluster random sampling with probability proportional to size comprising a nationally representative sample of adults aged ≥40 years from six ecological zones. Outcome measures. Distance vision was measured using reduced logMAR charts. Clinical examination included basic eye examination for all respondents and a detailed examination including visual fields, gonioscopy and fundus photography for those who were visually impaired or blind (i.e. presenting vision
