Homonymous hemianopsia is typically due to a lesion in which region?

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Multiple Choice

Homonymous hemianopsia is typically due to a lesion in which region?

Homonymous hemianopsia occurs when the visual pathway is damaged after the optic chiasm. After the chiasm, the pathways carry information about the contralateral visual field from both eyes. A lesion in the optic tract, lateral geniculate, optic radiations, or the occipital cortex disrupts the same (contralateral) half of the visual field in each eye, producing a homogeneous loss of that field in both eyes. This is why the typical site is post-optic chiasm. In contrast, damage before the chiasm affects only one eye, and lesions at the chiasm tend to cause loss of the outer (temporal) visual fields in both eyes.

Homonymous hemianopsia occurs when the visual pathway is damaged after the optic chiasm. After the chiasm, the pathways carry information about the contralateral visual field from both eyes. A lesion in the optic tract, lateral geniculate, optic radiations, or the occipital cortex disrupts the same (contralateral) half of the visual field in each eye, producing a homogeneous loss of that field in both eyes. This is why the typical site is post-optic chiasm. In contrast, damage before the chiasm affects only one eye, and lesions at the chiasm tend to cause loss of the outer (temporal) visual fields in both eyes.

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