Fatima Kyari|G. V. S. Murthy|Selvaraj Sivsubramaniam|Clare Gilbert|Mohammed M Abdull|Gabriel Entekume|Allen Foster
Prevalence of Blindness and Visual Impairment in Nigeria: The National Blindness and Visual Impairment Survey
National Eye Centre|London School of Hygiene & Tropical Medicine|London School of Hygiene & Tropical Medicine|London School of Hygiene & Tropical Medicine|Bauchi State University|London School of Hygiene & Tropical Medicine
purpose determine prevalence blindness visual impairment among adults aged 40 years nigeria methods multistage stratified cluster random sampling probability proportional size procedures used identify crosssectional nationally representative sample 15027 persons 40 years age 36 states nigeria federal capital territory distance visual acuity va measured reduced logmar tumblinge chart 4 1 presenting best corrected visual acuities recorded autorefraction performed examined adults clinical evaluations included examination dilation presenting vision 612 either eye results study 15122 persons aged 40 years enumerated 13599 899 examined prevalence blindness 20400 better eye severe visual impairment 2020020400 presenting vision 42 95 confidence interval ci 3846 15 95 ci 1317 respectively blindness associated increasing age female poor literacy residence north participants residing south west lowest prevalence north east highest prevalence blindness estimated 425 million adults aged 40 years moderate severe visual impairment blindness 2063 better eye conclusions high prevalence blindness severe visual impairment among aged 40 years nigeria significant differences exist geopolitical zones emphasis ensuring eye services across nigeria means planning regional level necessary