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Related Experiment Videos

Coloured patterns in hemianopic fields.

H W Kölmel

    Brain : a Journal of Neurology
    |March 1, 1984
    PubMed
    Summary

    Patients with visual field defects experienced colored phosphenes, suggesting a functional disorder rather than tissue loss. These visual phenomena are a prognostically favorable symptom in hemianopia.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Neurology

    Background:

    • Homonymous hemianopia and quadrantanopia result from various causes, often vascular lesions affecting the visual pathways.
    • Understanding the nature of visual disturbances is crucial for diagnosis and prognosis.

    Observation:

    • 14 out of 96 patients with visual field defects reported experiencing colored phosphenes (colored patterns) within their affected visual field.
    • These phosphenes presented as geometric patterns in red, green, blue, and yellow, with some translocation related to eye movement.

    Findings:

    • Patients experiencing phosphenes had homogeneous neurological findings, similar causes of hemianopia, and CT scan results showing small, circumscribed lesions in the occipital lobes.
    • The visual defects often resolved, indicating the phosphenes are linked to a functional disorder, not permanent tissue damage.
    • The consistent geometric structure and colors suggest organization within the visual cortex, possibly involving pyramids and tetrahedrons.

    Implications:

    • Colored phosphenes in hemianopia appear to be a prognostically favorable symptom.
    • The findings suggest these visual phenomena may originate in the prestriate area, indicating stimulation of intact color-coding neurons.
    • The study proposes a potential link between these phosphenes and the neuronal organization of the visual cortex, with possible implications for understanding migraine aura.

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