Visual Field Defect Flashcards
From proximal to distal, what are the components of the visual tract which can cause visual field defects?
Optic nerve
Optic chiasm
Optic tract
Optic radiations
Occipital cortex
What visual field defects do optic nerve lesions cause?
Loss of vision in ipsilateral eye
Name 4 potential causes of complete vision in one eye.
Anything affecting optic nerve:
Ischaemic optic neuropathy (GCA, atherosclerosis)
Optic neuritis
Glaucoma
Optic nerve tumours
How does optic neuritis present?
Progressive unilateral visual loss
Pain behind eye
Colour disturbance
Central scotoma
What visual field defects do optic chiasm lesions cause?
Bitemporal hemianopia
Name 2 causes of bitemporal hemianopia and who they are likely to affect
Pituitary adenoma (adults)
Craniopharyngioma (children)
What visual field defects do optic tract lesions cause?
Homonomous hemianopia (bilateral loss of left/right half of visual field)
What visual field defect would a left optic tract lesion cause?
Right homonomous hemianopia (loss of both right halves of visual field)
What visual field defect do optic radiation lesions cause?
Quadrantanopia
What visual field defects do occipital cortex lesions cause?
Homonomous hemianopia (bilateral loss of left/right half of visual field) with macular sparing
Left homonomous hemianopia:
- with central vision
- without central vision
is caused by ______.
- Right occipital cortex lesion
2. Right optic tract lesion