About the Author(s)
Abubakar Tafida
Department of Ophthalmology, Aminu Kano Teaching Hospital, Nigeria
Fatima Kyari
Baze University, Abuja, Nigeria
Mohammed Abdull ![symbol](http://aosis.co.za/resources/publishing/images/symbol.png)
Department of Ophthalmology, Abubakar Tafawa Balewa University Teaching Hospital, Nigeria
Faal Hannah
Department of Ophthalmology, University of Calabar Teaching Hospital, Nigeria
Clare E. Gilbert ![Email](http://aosis.co.za/resources/publishing/images/email.png)
Department of Clinical Research, London School of Hygiene & Tropical Medicine, United Kingdom
Note: On behalf of the National Survey of Blindness and Visual Impairment Study Group.
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