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opthalmology > Optic Nerve > Flashcards

Optic Nerve Flashcards

1
Q

The axons leave the eyeball through the?

A

Lamina crirosa sclerae

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2
Q

How does the optic nerve differe from all the other nerves?

A

It is not a peripheral nerve but rather a central nervous system tract and it has no ability to regenerate if it is damaged

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3
Q

What makes up the retrobulbar part of the optic nerve?

A
  1. The intra-orbital
  2. Intracanalicular
  3. Intra-cranial
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4
Q

What is theocular part made of?

A

The optic disk

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5
Q

What makes the retro-bulbar relatively resistant to ocular occlusion?

A

There is a complex anastomosis of various branches of the internal carotid artery

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6
Q

Why is the optic disk prone to vascular occlusion?

A

Because it has short posterior ciliary branches of the internal cariotid artery

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7
Q

What are the symptoms of optic nerve disease?

A
  1. Loss of vision
  2. Retrobulbar pain occurs only in optic neuritis
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8
Q

What are the signs of optic nerve damage?

A
  1. Decreased VA
  2. Decreased VF
  3. Pupil:sluggish reaction to light
  4. Disc appearance may appear swollen because of raised intracranial pressure
  5. or pale due to optic atrophy
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9
Q

What are the 4 characteristics of the optic disc that we must always assess on opthalmoscopy?

A
  1. The margin/contour and whether it is well defined
  2. The colour which is usually pink
  3. The cup or C/D ratio
  4. The blood vessels or venous pulsation to ensure that there is not cental retinal venous occlusion
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10
Q

What does this image depict?

A
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11
Q

Name 7 characteristics that is the classical appearance of optic swelling?

A
  1. Disc hyperaemia and dilated capillaries on the disc
  2. The disc margin/contour is indistinct
  3. Disc and retinal venous congestion
  4. Loss of retinal venous pulsation
  5. Cotton wool spots on and around the disc
  6. Hard exudates around the disc
  7. Nerve fibre layer haemorrhages on and around the disc
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12
Q

What are the two exceptions to the classical appearance

A
  1. Anterior IschaemicOptic Neuropathy
  2. Central Retinal Venous Occlusion
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13
Q

What are transient obscurations of vision?

A

Multiple episodes of blurred vision each which last for only a few seconds

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14
Q

Is optic disc swelling unilateral or bilateral?

A

It is usually bilateral and symmetrical

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15
Q

What is the Foster-Kennedy syndrome?

A

A condition causing unilateral optic disk swelling in raised intracranial pressure

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16
Q

What happens when there is a intracranial tumour?

A

There is atrophy on the intracranial part of the intra-cranial nerve and this means that the contralateral optic disc gets swollen because the affected side has lost its nerve fibres

17
Q

Define optic neuritis

A

Optic neiritis is inflammation of the optic nerve

18
Q

What is papillitis?

A

Inflammation of the optic disc

19
Q

What is retrobulbar neuritis?

A

Inflammation of the retrobulbar part of the optic nerve

20
Q

What are the causes of optic neuritis?

A
  1. multiple sclerosis in adults
  2. Bacterial-TB and Syphillis
  3. Viral- mumps, measles, chicken pox and these usually affect children
  4. Systemic inflammations- sarcoidosi
21
Q

What are the clinical symptoms of optic neuritis?

A

Unilateral loss of vision-which is usually dramatic and maximal within a few days of onset

Vision usually improves 2- 3 weeks later and the rate and degree of visual recovery is variable

Retrobulbar pain is only in retrobulbar neuritis

22
Q

What are 4 signs of optic neuritis on ophthalmoscopy?

A
  1. Decreased VA
  2. VF defect: central scotoma
  3. Pupil is sluggish to light
  4. On ophthalmoscopy- There is papillitis(optic disc swelling)
23
Q

What is Anterior Ischaemic Optic Neuropathy?

A

Partial or complete infarction of the optic disc due to posterior ciliary arterial occlusion

24
Q

What are the causes of anterior ischaemic optic disc neuropathy?

A

arteriosclerosis and giant cell arteritis

25
Q

What are the symptoms of AION?

A

Sudden unilateral painless loss of vision in an elderly patient. The visual loss is typically maximal at onset

26
Q

What are the signs associated with AION?

A
  1. Decreased visual acuity-even as bad as Hand Movements
  2. VF defect which depends on the size and position of the infarct
  3. Puipl will be sluggish response to light and relative afferent pupil defect
  4. On ophthalmoscopy there will be a pale and swollen disc
27
Q

What is the management of AION-giant cell arteritis?

A

High dose of systemic steroids may help the affected eye and prevent spread to the second eye

ESR and CRP must be obtained and a temporal artery biopys obtained

28
Q

What does amblyopia mean?

A

lazy eye

29
Q

What causes optic atrophy?

A

optic nerve axonal loss

30
Q

What are the causes of optic atrophy?

A

The causes of optic atrophy are:

  1. congenital
  2. Traumatic
  3. Inflammatory-secondary to optic neuritis
  4. Compression from tumours-meningiomas, aneurysm of the anterior circulus arteriosus
  5. Vascular-Glaucoma, Diabetes Mellitus, arteriosclerosis
  6. Nutrional amblyopia
  7. Toxic-methanol/ethanol
31
Q

What is the clinical picture of optic atrophy?

A

Main symptoms is loss of vision

32
Q

What does this eye depict?

A

Optic atrophy

33
Q

Describe optic atrophy?

A

It has a pale optic disk but it is a well defined margin

34
Q
A

opthalmology (12 decks)

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