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Homonymous hemianopia

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In homonymous hemianopia - literally, a loss of vision on the same side in both eyes - the field loss is usually the result of a lesion in the optic radiation or tract on one side. The visual defect is dependent on the site of the lesion:

  • right-hand sided lesions lead to left temporal and right nasal field loss
  • left-hand sided lesions lead to right temporal and left nasal field loss

Macular vision is usually lost in lesions arising in the optic tract; it is usually spared in lesions arising in the more posterior optic radiation.

Causes of homonymous hemianopia include vascular disease, head injury or cerebral tumours.

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