Unit 2: Visual field defects, double vision & optic disc swelling

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Visual field defects

Image credit: Luckmann's Core Principles and Practice of Medical-Surgical Nursing

Rules

  • Lesions anterior to the chiasm produce unilateral field defects
  • Lesions posterior to the chiasm produce contralateral homonymous defects
  • Chiasmal lesions generally produce bitemporal defects.
  • The more congruous the defect the more posterior in the visual pathway the lesion