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Related Experiment Videos

Binasal hemianopia

R F Salinas-Garcia, J L Smith

    Surgical Neurology
    |September 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Binasal visual field defects are often suspected to be caused by intracranial issues. However, this study found that intraocular causes, such as ischemic optic neuropathy and glaucoma, are more common in patients with these visual field defects.

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    Area of Science:

    • Ophthalmology
    • Neurology
    • Neuro-ophthalmology

    Background:

    • Binasal visual field defects have historically been attributed to intracranial pathologies since Cushing and Walker's 1912 report.
    • Neuro-ophthalmologic examinations are crucial for diagnosing the underlying causes of visual field abnormalities.

    Observation:

    • A review of 100 patients revealed eight cases with binasal visual field defects.
    • The study investigated the etiology of these defects, challenging the long-held assumption of intracranial origins.

    Findings:

    • Intraocular causes accounted for 75% of the binasal hemianopia cases.
    • Specific intraocular conditions identified include ischemic optic neuropathy, optic nerve drusen, glaucoma, congenital optic nerve pits, and retinitis pigmentosa sine pigmento.

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  • Intracranial causes, such as congenital hydrocephalus, were identified in only 25% of the cases.

    • Implications:

    • Neurosurgeons should consider ocular causes as the primary differential diagnosis for patients presenting with binasal field defects.
    • This finding necessitates a shift in diagnostic focus towards comprehensive ophthalmologic evaluation for binasal hemianopia.
    • Accurate diagnosis is critical for appropriate patient management and treatment of visual field loss.