QuestionSBA
QuestionChoice
The optic tract is after the optic chiasm, which is where visual information crosses over. The optic tract carries visual information from either the left or right side only. The most common cause is stroke, which damages one side of the brain. If the right side of the brain is damaged, the left visual field will be affected (i.e. contralaterally). This visual field finding is called contralateral homonymous hemianopia.
10000831
a
Optic tract
QuestionChoice
The optic radiations carry information from one-quarter of each eye to the visual cortex. Damage will cause contralateral quadrantopia.
10000832
b
Optic radiation
QuestionChoice
Damage to an area of the visual cortex will cause scotoma in both eyes. This is where patchy visual loss occurs in the same visual fields from both eyes.
10000835
e
Occipital cortex
QuestionChoice
The optic nerve carries information from one eye. Damage to one optic nerve will cause blindness in one eye. This is known as monocular vision loss.
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d
Optic nerve
QuestionChoice
The optic chiasm is where information from the outer visual field crosses over. Compression of the optic chiasm will cause a visual field defect affecting the outer visual fields of both eyes. The visual field defect is called bitemporal hemianopia. Often, a pituitary tumour below will compress the chiasm, causing this presentation.
10000833
c
Optic chiasm
Concept
Chapter
2693
3833
Visual pathway anatomy
Topic
152
Neuroscience
12713
Picture
1509
Left Homonymous Hemianopia.jpeg
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Topic
152
Neuroscience
A 63-year-old woman comes in with visual problems. The results of her visual field test are shown. Damage to which part of the visual pathway has caused this visual field defect?

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a