Nigeria national blindness and visual impairment survey

Nigeria survey

Providing the evidence and data needed to provide effective eye care in Nigeria

Nigeria is among the ten most populated countries  in the world. Despite its size there had been no earlier national estimate of the prevalence and causes of blindness and visual impairment before the Nigeria national blindness and visual impairment survey was conducted between 2005 and 2007. Six collaborating institutions took part and ICEH provided technical guidance for the survey design, provision of training, external supervision of the survey activities, data analysis and report writing.

As a result, for the first time scientifically valid data are available for the entire country providing the epidemiological evidence and data needed for eye care planning, priority setting, advocacy and for measuring the impact of service delivery in Nigeria. The data also contribute towards the global database of blindness, which is being used for global planning, advocacy, resource mobilisation and to monitor VISION 2020 initiatives.

Overview

  • The National Blindness and Visual Impairment  Survey in Nigeria was conducted in 2005-2007
  •  Multi-stage stratified cluster random sampling was used to select a cross-sectional, nationally representative sample of the population
  • A total of 13,599 persons aged 40+ were examined across the country

Vision loss in Nigeria

  • It is estimated that 1.13 million individuals aged 40 years are currently blind in Nigeria.
  • A further 2.7 million adults aged 40 years are estimated to have moderate visual impairment and an additional 400,000 adults are severely visually impaired.
  • 4.25 million adults aged 40 years in Nigeria are visually impaired or blind.

Survey report

Download the survey report for more details on the survey methodology and summary findings (PDF 2.3Mb)

Acknowledgements

The National Survey of Blindness and Visual Impairment is the biggest ever survey in Africa. This huge task, which took more than three years to complete including 30 months of rigorous field work, was only possible because of the special efforts of key individuals.  We record our appreciation for the efforts made by the Federal Government of Nigeria, State Governments and local government authorities for all their support. We acknowledge the financial support of Sightsavers,  CBM and the Velux Stiftung.

Sightsavers

CBM

Velux Stiftung

Publications

  • Mahdi AM, Rabiu M, Gilbert C, Sivasubramaniam S, Murthy GV, Ezelum C, Entekume G; Nigeria National Blindness and Visual Impairment Study Group. Prevalence and risk factors for lens opacities in Nigeria: results of the national blindness and low vision survey. Invest Ophthalmol Vis Sci. 2014 Apr 21;55(4):2642-51. doi: 10.1167/iovs.12-10303. Abstract
  • Murthy GV, Fox S, Sivasubramaniam S, Gilbert CE, Mahdi AM, Imam AU, Entekume G; on behalf of the Nigeria National Blindness and Visual Impairment study group. Prevalence and risk factors for hypertension and association with ethnicity in Nigeria: results from a national survey. Cardiovasc J Afr. 2013 Sep 11;24:1-7. Article
  • Rabiu MM, Kyari F, Ezelum C, Elhassan E, Sanda S, Murthy GV, Sivasubramaniam S, Glibert C, Abdull MM, Abiose A, Bankole O, Entekume G, Faal H, Imam A, Sang LP, Abubakar T. Review of the publications of the Nigeria national blindness survey: methodology, prevalence, causes of blindness and visual impairment and outcome of cataract surgery. Ann Afr Med. 2012 Jul-Sep;11(3):125-30. Abstract
  • Abubakar T, Gudlavalleti MV, Sivasubramaniam S, Gilbert CE, Abdull MM, Imam AU. Coverage of hospital-based cataract surgery and barriers to the uptake of surgery among cataract blind persons in Nigeria: The Nigeria National Blindness and Visual Impairment Survey. Ophthalmic Epidemiol. 2012 Apr;19(2):58-66. Epub 2012 Feb 24. Abstract
  • Entekume G, Patel J, Sivasubramaniam S, Gilbert CE, Ezelum CC, Murthy GV, Rabiu MM; for the Nigeria National Blindness and Visual Impairment Study Group. Prevalence, causes, and risk factors for functional low vision in Nigeria: results from the National Survey of Blindness and Visual Impairment. Invest Ophthalmol Vis Sci. 2011 Aug 24;52(9):6714-6719. Print 2011. Article
  • Ezelum C, Razavi H, Sivasubramaniam S, Gilbert C, Murthy GV, Entekume G, Abubakar T; Nigeria National Blindness and Visual Impairment Study Group. Refractive errors in Nigerian adults: prevalence, types and spectacle coverage. Invest Ophthalmol Vis Sci. 2011 Jul 23;52(8):5449-56. Print 2011.  Article
  • Tran HM, Mahdi AM, Sivasubramaniam S, Gudlavalleti MV, Gilbert CE, Shah SP, Ezelum CC, Abubakar T, Bankole OO; on behalf of the Nigeria National Blindness and Visual Impairment Study Group. Quality of life and visual function in Nigeria: findings from the National Survey of Blindness and Visual Impairment. Br J Ophthalmol. 2011 Jul 11. Abstract
  • Imam AU, Gilbert CE, Sivasubramaniam S, Murthy GV, Maini R, Rabiu MM; Nigeria National Blindness and Visual Impairment Study Group. Outcome of cataract surgery in Nigeria: visual acuity, autorefraction, and optimal intraocular lens powers-results from the Nigeria national survey. Ophthalmology.Volume 118, Issue 4, April 2011, Pages 719-724 Abstract
  • Rabiu MM, Murthy GVS, Gilbert CE, Sivasubramaniam S, Kyari F, Abubakar T, on behalf of the Nigeria National Blindness and Visual Impairment Study Group. Ecological determinants of blindness in Nigeria: The Nigeria National Blindness and Visual Impairment Survey SAMJ January 2011, Vol. 101, No. 1. Article
  • Gilbert CE, Murthy GV, Sivasubramaniam S, Kyari F, Imam A, Rabiu MM, Abdull M, Tafida A. Couching in Nigeria: prevalence, risk factors and visual acuity outcomes. Ophthalmic Epidemiol. 2010 Oct;17(5):269-75. Abstract
  • Abdull MM, Sivasubramaniam S, Murthy GV, Gilbert C, Abubakar T, Ezelum C, Rabiu MM; Nigeria National Blindness and Visual Impairment Study Group. Causes of blindness and visual impairment in Nigeria: the Nigeria national blindness and visual impairment survey. Invest Ophthalmol Vis Sci. 2009 Sep;50(9):4114-20. Epub 2009 Apr 22. Article
  • Kyari F, Gudlavalleti MV, Sivsubramaniam S, Gilbert CE, Abdull MM, Entekume G, Foster A; Nigeria National Blindness and Visual Impairment Study Group. Prevalence of blindness and visual impairment in Nigeria: the national blindness and visual impairment study. Invest Ophthalmol Vis Sci. 2009 May;50(5):2033-9. Epub 2008 Dec 30. Article
  • Dineen B, Gilbert CE, Rabiu M, Kyari F, Mahdi AM, Abubakar T, Ezelum CC, Gabriel E, Elhassan E, Abiose A, Faal H, Jiya JY, Ozemela CP, Lee PS, Gudlavalleti MV. The Nigerian national blindness and visual impairment survey: rationale, objectives and detailed methodology. BMC Ophthalmol 2008 Sep 22;8:17. Article

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Image credit: Clare Gilbert / LSHTM

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