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Binasal hemianopia.

J E O'Connell, E P Du Boulay

    Journal of Neurology, Neurosurgery, and Psychiatry
    |October 1, 1973
    PubMed
    Summary
    This summary is machine-generated.

    Compression of optic nerve fibers by arteries can cause binasal hemianopia, a true hemianopia. Neuroradiological imaging is crucial for diagnosing these visual field defects.

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    Area of Science:

    • Ophthalmology
    • Neurology
    • Radiology

    Background:

    • Nasal visual field defects are uncommon.
    • The optic nerve's lateral fibers are susceptible to compression.
    • Vascular compression is a potential cause of visual field loss.

    Purpose of the Study:

    • To describe cases of binasal hemianopia caused by arterial compression.
    • To highlight the significance of vascular compression on optic nerve fibers.
    • To emphasize the role of neuroradiology in diagnosing visual field defects.

    Main Methods:

    • Case study of three patients with nasal visual field defects.
    • Clinical examination and visual field testing.
    • Neuroradiological investigations (e.g., MRI, CT angiography) to visualize optic nerve and related vasculature.

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    Main Results:

    • Three patients presented with binasal hemianopia.
    • Arterial compression (anterior cerebral or internal carotid artery) of lateral optic nerve fibers was identified as the cause.
    • Demonstrated that a single lesion can produce binasal hemianopia.

    Conclusions:

    • Binasal hemianopia can result from compression of the optic nerve by adjacent arteries.
    • This condition represents a true hemianopia, similar to bitemporal hemianopia.
    • Neuroradiological imaging is essential for elucidating the relationship between lesions, optic pathways, and vascular structures in cases of visual field defects.