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binasal hemianopia
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binasal hemianopia

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Quick Summary

Binasal hemianopia is a type of visual field defect where the outer half of the visual field in both eyes is lost. This condition occurs when there is damage or a lesion affecting the inner (nasal) sides of both retinas or the visual pathways behind the optic chiasm. The optic chiasm is where the optic nerves from each eye meet and partially cross over.1

Unlike bitemporal hemianopia, which suggests a lesion at the optic chiasm itself (often caused by a pituitary tumor), binasal hemianopia points to issues affecting the visual fields on the nasal side of each eye. This can be caused by conditions that impact the visual pathways symmetrically. Testing with a perimeter can precisely map these visual field defects.1

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2 Britannica Sources
  1. visual field defect
  2. human eye - The visual field

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