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Ophthamology > Eye neurology > Flashcards

Flashcards in Eye neurology Deck (23)
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1

Which part of the brain is the visual cortex in?

Occipital lobe

2

Describe the pathway of the visual field

Globes
Optic nerves
Optic chiasm
Optic tract
Lateral geniculate
Cortex

3

What muscle does CN VI supply?

Lateral rectus

4

How is lateral rectus tested?

Try to look laterally. Eye will pull medial if LR injured

5

What causes a CN VI palsy?

Microvascular
Raised ICP
Tumour

6

What is commonly associated with CN VI palsy?

Bilateral papilloedema

7

What muscle does CN IV supply?

Superior oblique

8

How is a CN IV palsy tested?

Eye will look superior since SO causes depression when adducted

9

Why is there a head tilt present in CN IV palsy?

SO also causes some intorsion so the head has to make up for this

10

What can also cause bilateral CN IV palsy?

Blunt head trauma since CN IV is at the back of the head so any trauma may cause stretching

11

How many muscles does CN III supply in the eye region?

6

12

What is the common presentation for a CN III palsy?

Down and out

13

Why is a CN III palsy an emergency?

If painful then likely an aneurysm
Also affects levator palpebrae superioris so affects the eyelid

14

What is strabismus?

Squint

15

What is inter-nuclear ophthalmoplegia?

The affected eye will not adduct
Unaffected eye will show nystagmus

16

Where is the injury in inter-nuclear ophthalmoplegia?

Medial Longitudinal Fasiculus, where CN III, IV and VI meet

17

What is the most common cause of INO?

Multiple Sclerosis

18

What other, apart from INO, condition is found commonly in MS?

Optic neuritis

19

What is ION?

ischaemic optic neuropathy

20

What signs will an optic neuritis present with?

Progressive unilateral visual loss
Colour desaturation
Central scotoma
**Pain on moving eye**

21

How is optic neuritis treated?

Steroids

22

What pathology which affects the optic chiasm can cause visual loss?

Pituitary tumours

23

If a pathology causes loss of sight of one side of the eye bilaterally, where is the pathology?

Lateral geniculate bodies
or
in occipital cortex