Visual Pathway
Visual Pathway:
What is the name of each lesion and what can cause them? Click ? to reveal.
| Visual Fields* | |||
|---|---|---|---|
| R | L | ||
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1 | ? Uniocular visual loss in left eye: Anterior ischaemic optic neuropathy, optic neuritis, optic nerve trauma / tumour |
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2 | ? Bitemporal hemianopia: Pituitary adenoma (bitemporal superior quadrantanopia), craniopharyngioma (bitemporal inferior quadrantanopia) |
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3 | ? Right homonymous hemianopia: Left hemispheric stroke, tumour or infection |
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4 | ? Right homonymous superior quadrantanopia: Left temporal lobe stroke, tumour or infection |
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5 | ?Right homonymous inferior quadrantanopia, macular sparing: left occipital lobe stroke, tumour or infection |
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6 | ?Right homonymous superior quadrantanopia, macular sparing: left occipital lobe stroke, tumour or infection |
*drawn from physician's perspective
Mnemonic to remember 4:
Pie In The Sky
Parietal lesions are Inferior
Temporal lesions are Superior
For 5 and 6 (extra knowledge!):
Macular sparing occurs when there is ischaemia in one hemisphere of the visual cortex. This is postulated to be due to macular portions of the visual cortex having double vascular supply (middle cerebral artery and posterior cerebral artery), hence a blockage in one of these vessels would not cause infarction of this region.
