Flashcards in Eye neurology Deck (23)
Which part of the brain is the visual cortex in?
Describe the pathway of the visual field
What muscle does CN VI supply?
How is lateral rectus tested?
Try to look laterally. Eye will pull medial if LR injured
What causes a CN VI palsy?
What is commonly associated with CN VI palsy?
What muscle does CN IV supply?
How is a CN IV palsy tested?
Eye will look superior since SO causes depression when adducted
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
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
How many muscles does CN III supply in the eye region?
What is the common presentation for a CN III palsy?
Down and out
Why is a CN III palsy an emergency?
If painful then likely an aneurysm
Also affects levator palpebrae superioris so affects the eyelid
What is strabismus?
What is inter-nuclear ophthalmoplegia?
The affected eye will not adduct
Unaffected eye will show nystagmus
Where is the injury in inter-nuclear ophthalmoplegia?
Medial Longitudinal Fasiculus, where CN III, IV and VI meet
What is the most common cause of INO?
What other, apart from INO, condition is found commonly in MS?
What is ION?
ischaemic optic neuropathy
What signs will an optic neuritis present with?
Progressive unilateral visual loss
**Pain on moving eye**
How is optic neuritis treated?
What pathology which affects the optic chiasm can cause visual loss?