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Visual Field Defects

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Topic updated on 11/12/17 12:05pm

Introduction
 

 
Central Scotoma - 1
  • Lesion of the macula
    • causes loss of central vision 
Optic Nerve Transection - 2
  • Transection of the optic nerve
    • loss of nasal and temporal visual fields of single eye
    • loss of all visual information from 1 eye
Lesion/Compression of Optic Chiasm (Bitemporal Hemianopsia) - 3
  • Patient unable to see in bilateral temporal fields
    • Usually caused by lesion in optic chiasm
      • most commonly associated with pituitary tumors
      • also occurs with craniopharyngiomas, meningiomas, anterior communicating artery aneurysms
Lesion of Optic Tract - 4
  • Optic tract contains visual information from:
    • ipsilateral nasal field
    • contralateral temporal field
      • this results in homonymous hemianopsia 
Lesion of Meyer's Loop - 5
  • Meyer's loop innervates the inferior ipsilateral part of the retina serving the upper contralateral wedge of vision (pie in the sky
Dorsal Optic Radiation Lesion - 6
  • Dorsal optic radiations innervate the ipsilateral superior part of the retina
    • this means that the contralateral inferior wedge of vision is lost
Visual Cortex Lesion - 7
  • Unilateral lesion of the visual cortex causes vision loss of the contralateral visual field
    • the central area of vision is often spared because of redundant coverage of this area with the contralateral visual cortex



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