RESUMO
CONTEXT: Optic atrophy is a clinical sign and not a disease. The etiology of optic atrophy is diverse, some of which may be life threatening. PATIENTS AND METHODS: A retrospective review of the medical records of all adult patients aged 16 years and above with nonglaucomatous optic atrophy at the eye clinic of the University of Benin Teaching Hospital over a 4-year period was conducted. RESULTS: One hundred and four patients had nonglaucomatous optic atrophy. There were 58 males and 46 females with a male:female of 1.3:1. Their ages ranged from 16 to 83 years with a mean age of 49.2 ± 17.74 years. Majority (75%) of the patients were in the age range of 31-70 years. One hundred and fifty-seven eyes were affected with bilateral involvement in 53 patients. The etiology was unknown in 47 (45.2%) patients. Choriodoretinal disease 24 (23.1%), trauma 14 (13.5%), toxic-nutritional 8 (7.7%) and compressive lesions 5 (4.8%) were the most common among the known etiologies. CONCLUSION: Optic atrophy is the end result of injury to the anterior visual pathway from a myriad of disease processes. A broad knowledge of the etiology of optic atrophy is needed to make a diagnosis .
Assuntos
Atrofia Óptica/patologia , Doenças do Nervo Óptico/patologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias Encefálicas/complicações , Neoplasias Encefálicas/epidemiologia , Traumatismos Oculares/complicações , Traumatismos Oculares/epidemiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Nigéria/epidemiologia , Atrofia Óptica/epidemiologia , Atrofia Óptica/etiologia , Neurite Óptica/complicações , Neurite Óptica/epidemiologia , Prevalência , Estudos Retrospectivos , Acuidade Visual , Adulto JovemRESUMO
Myelinated retinal nerve fibres (MRNF) are rare congenital anomalies. They may present in a syndrome characterised by ipsilateral myelinated retinal nerve fibres, myopia and amblyopia. We report a case of this rare condition with unilateral extensive MRNF, axial myopia, amblyopia and strabismus in a Nigerian girl.
RESUMO
While ethambutol optic neuropathy usually causes central or cecocentral scotomas, bitemporal visual field defects also have been reported. The pathogenesis of the bitemporal hemianopia has not been established. This article describes magnetic resonance imaging abnormalities involving the optic chiasm in a patient with bitemporal visual field loss. To our knowledge, these neuroimaging findings have not been previously described in association with ethambutol therapy.