Visual Field Defect Flashcards

1
Q

From proximal to distal, what are the components of the visual tract which can cause visual field defects?

A

Optic nerve

Optic chiasm

Optic tract

Optic radiations

Occipital cortex

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2
Q

What visual field defects do optic nerve lesions cause?

A

Loss of vision in ipsilateral eye

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3
Q

Name 4 potential causes of complete vision in one eye.

A

Anything affecting optic nerve:

Ischaemic optic neuropathy (GCA, atherosclerosis)

Optic neuritis

Glaucoma

Optic nerve tumours

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4
Q

How does optic neuritis present?

A

Progressive unilateral visual loss

Pain behind eye

Colour disturbance

Central scotoma

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5
Q

What visual field defects do optic chiasm lesions cause?

A

Bitemporal hemianopia

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6
Q

Name 2 causes of bitemporal hemianopia and who they are likely to affect

A

Pituitary adenoma (adults)

Craniopharyngioma (children)

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7
Q

What visual field defects do optic tract lesions cause?

A

Homonomous hemianopia (bilateral loss of left/right half of visual field)

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8
Q

What visual field defect would a left optic tract lesion cause?

A

Right homonomous hemianopia (loss of both right halves of visual field)

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9
Q

What visual field defect do optic radiation lesions cause?

A

Quadrantanopia

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10
Q

What visual field defects do occipital cortex lesions cause?

A

Homonomous hemianopia (bilateral loss of left/right half of visual field) with macular sparing

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11
Q

Left homonomous hemianopia:

  1. with central vision
  2. without central vision

is caused by ______.

A
  1. Right occipital cortex lesion

2. Right optic tract lesion

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