Visual System - Lesions Flashcards

1
Q

Lesion to visual association cortex

A

Disorders of higher-order visual processing

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2
Q

Lesion of retina or optic nerves

A

Produce monocular visual field defects (A,B)

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3
Q

Lesions to optic chiasm

A

Bitemporal visual field deficits (C)

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4
Q

Lesions posterior to chiasm

A

(Optic tracts, LGN, optic radiations, visual cortex)

Homonymous visual field changes - defect in same region for both eyes

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5
Q

Lesions to optic radiations

A

Homonymous defects affecting the contralateral visual field

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6
Q

Lesion of ipsilateral optic radiation

A

Contralateral homonymous hemangioma a visual field defect (G)

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7
Q

Temporal lobe lesion

A

Contralateral homonymous superior quadrantopia “pie in the sky” visual field defect (E)

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8
Q

Lower parietal lobe lesion

A

Contralateral homonymous inferior quadrantopia “pie on the floor” visual field defect (f)

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9
Q

Lower bank lesion

A

Contralateral homonymous superior quadrantanopia

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10
Q

Lesion to ther right lower back of PVC would cause what visual field defect?

A

Left superior quandrantanopia

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11
Q

Upper bank lesions

A

Contralateral homonymous inferior quadrantanopia

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12
Q

Lesion to right upper bank of PVC would cause?

A

Left inferior quadrantanopia

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13
Q

Lesion of the retina

A

Area of retina damaged would reflect damage to associated visual field.
Causes: infarcts, hemorrhage, degeneration, infection

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14
Q

Complete lesion of the optic nerve

A

Information from entire retina of that eye

Causes: glaucoma, optic neuritis, neuropathy, elevated ICP, tumors, trauma

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15
Q

Lesion involving the entire retina

A

Monocular vision loss

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16
Q

Lesion of optic chiasm

A

Causes: pituitary adenoma, hypothalamus glioma, other tumors

Susceptible to pituitary tumors or other lesions in this area

17
Q

Lesions of the optic tract

A

Causes: tumor, infarct, demylelination

18
Q

Lesion to LGN

A

Cause contralateral homonymous hemaniopia

19
Q

Lesions of entire optic radiations

A

Infarct, tumor, demyelination, trauma, hemorrhage

20
Q

Lesions of entire PVC

A

PCA infarcts, tumor, infection

21
Q

Lesion in parietal lobe

A

MCA superior division infarcts

22
Q

lesion to upper bank of calcarine fissure

A

PCA infarcts, hemorrhage, tumors, infection, trauma to occipital pole.

23
Q

Lesion in temporal lobe

A

MCA inferior division infarcts

24
Q

Lesion to lower bank of calcarine fissure

A

PCA infarcts, hemorrhage, tumors, infections, trauma to occipital pole

25
Q

Partial lesion to visual pathways

A

Sometimes result in ventral visual field being spared

26
Q

Lesion to occipital pole

A

Area represented by fovea and macula and would result in visual loss in the center of the visual field