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The Ophthalmology
Survival Guide
Bitemporal Hemianopia
Lesions of the optic chiasm, primarily affecting optic nerve fibers that represent projections from the nasal retina (and therefore temporal visual field) from each eye, produce bitemporal hemianopia, a visual defect.
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Lesions of the optic chiasm, or posterior to the chiasm (i.e. on the brain side of the chiasm), produce visual field defects that are bilateral and fairly or highly symmetric.
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This sort of defect may not be highly congruent (i.e. symmetric in each eye), but is highly localizing.
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