title: Non-glaucomatous optic neuropathy in ibadan: extrapolations to healthcare funding in Nigeria.
abstract: BACKGROUND
  Optic neuropathy is not a diagnosis in itself, as potential aetiologies are myriad. A pilot study conducted in the Eye Clinic, University College Hospital, Ibadan, between September 2007 and November 2009, showed that 46.8% of new cases presenting to the neuroophthalmology unit, had non-glaucomatous optic neuropathy (NGON) in which, the precise aetiology of optic neuropathy was never diagnosed.
  
  
  METHODS
  All cases of NGON, seen in the neuro-ophthalmology unit, between September 2007 and June 2014 were analyzed to determine common aetiologies and identify the difficulties encountered in their investigation or management.
  
  
  RESULTS
  There were 159 cases of NGON. The age range was 6 months to 87 years (mean 39.0, SD 21.3). Male: Female ratio was 1.2: 1, and the commonest diagnosis was optic atrophy of unknown aetiology. Challenges identified included difficulty obtaining recommended radiological and serological investigations, as well as no access to genetic studies and high loss to follow-up.
  
  
  CONCLUSIONS
  There are major constraints in the investigation of patients presenting with optic nerve disease in Ibadan, despite the prevalence of NGON as a major cause of visual disability among neuro-ophthalmic patients in this setting. Diagnostic constraints must be addressed, to facilitate neuroophthalmology patient care, within our limited resources.
authors.affiliation: Department of Ophthalmology, College of Medicine, University of Ibadan.
authors.forename: O A
authors.initials: OA
authors.lastname: Ogun
authors.affiliation: Department of Ophthalmology, College of Medicine, University of Ibadan.
authors.forename: O A
authors.initials: OA
authors.lastname: Adediran
keywords: Aetiology; Healthcare funding; National health insurance; Neuroophthalmology; Non-glaucomatous optic neuropathy; Optic atrophy