Visual Field Deficits

Question 1

In a pre-chiasmal lesion which eye is affected?

Answer 1

one eye only ipsilateral

Question 2

What can cause a pre-chiasmal lesion?

Answer 2

1. Optic neuritis
2. Amaurosis fugax
3. Optic atrophy
4. Retrobulbar optic neuropathy
5. Trauma

Question 3

What does a chiasmal lesion result in?

Answer 3

bitemporal hemianopia

Question 4

What are the causes of a chiasmal lesion?

Answer 4

1. Pituitary adenoma

2. Suprasellar aneurysm

Question 5

What does a post chiasmal lesion result in?

Answer 5

homonymous contralateral

Question 6

What are the causes of post chiasmal lesion?

Answer 6

1. Stroke
2. Tumour
3. Trauma

Question 7

What cranial nerve is CN III?

Answer 7

occulomotor

Question 8

What cranial nerve is IV?

Answer 8

trochlear

Question 9

What cranial nerve is VI?

Answer 9

abducens

Question 10

Which muscles does CNIII innervate?

Answer 10

1. Superior rectus
2. Inferior rectus
3. Medial rectus
4. Inferior oblique

Question 11

What muscle does CN IV innervate?

Answer 11

superior oblique

Question 12

What muscles does CN VI innervate?

Answer 12

lateral rectus

Question 13

What does occulomotor palsy result in?

Answer 13

1. Ptosis
2. Mydriasis
3. Down and out

Question 14

What is Mydriasis?

Answer 14

dilated pupils

Question 15

What does trochlear palsy show as?

Answer 15

prevents eye moving inwards and down

Question 16

What does abducens palsy show as?

Answer 16

prevent movement outwards

Question 17

What is amaurosis fugax?

Answer 17

transient loss of vision due to lack of blood supply to the retina

Question 18

What is optic neuritis?

Answer 18

inflammation of the optic nerve

Question 19

How do pituitary adenomas grow?

Answer 19

upward from the pituitary stalk, compress the chiasm from below