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Neurology > Visual Field Defects > Flashcards

Visual Field Defects Flashcards

1
Q

What is hemianopia?

A

Loss of one half of your visual field

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2
Q

What is homonymous hemianopia?

A

Loss of vision in the same half of both eyes.

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3
Q

Where is the lesion in someone with left homonymous hemianopia?

A

In the right optic tract

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4
Q

Where is the lesion in someone with right homonymous hemianopia?

A

In the left optic tract

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5
Q

What is bitemporal hemianopia?

A

Vision is missing in the outer half of both the right and left visual field

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6
Q

Where is the lesion in someone presenting with bitemporal hemianopia?

A

Optic chiasm

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7
Q

What is the optic chiasm?

A

Where the nasal fibres of each eye cross the midline to join the temporal fibres of the contralateral eye

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8
Q

If there is upper quadrant defect > lower quadrant defect in someone with bitemporal hemianopia, where is the compression?

A

Inferior chiasmal compression

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9
Q

What is inferior chiasmal compression usually due to in someone with bitemporal hemianopia?

A

Pituitary tumour

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10
Q

If there is inferior chiasmal compression in someone with bitemporal hemianopia, what defect presents?

A

Upper quadrant defect

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11
Q

If there is lower quadrant defect > upper quadrant defect in someone with bitemporal hemianopia, where is the compression?

A

Superior chiasmal compression

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12
Q

What is superior chiasmal compression usually due to in someone with bitemporal hemianopia?

A

Craniopharyngioma

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13
Q

What is a congruous defect?

A

A complete or symmetrical visual field loss

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14
Q

What is an incongruous defect?

A

Incomplete or asymmetric visual field loss

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15
Q

Where would the lesion be in someone presenting with homonymous hemianopia with incongruous defects?

A

Lesion of the optic tract

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16
Q

Where would the lesion be in someone presenting with homonymous hemianopia with congruous defects?

A

Lesion of optic radiation or occipital cortex

17
Q

Where would the lesion be in someone presenting with homonymous hemianopia with macular sparing?

A

Lesion of occipital cortex

18
Q

What is homonymous quadrantopia?

A

Loss of vision in the same lower quadrant of visual field

19
Q

What would a lesion in the temporal lobe result in?

A

Contralateral homonymous superior (upper) quadrantanopia

20
Q

What would a lesion in the parietal lobe result in?

A

Cntralateral homonymous inferior (lower) quadrantanopia

21
Q

What would a lesion in the occipital lobe result in?

A

Contralateral homonymous hemianopia

Neurology (63 decks)

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