optic disc and visual fields

Question 1

which cranial nerve is the optic nerve?

Answer 1

CNII

Question 2

Is the optic nerve an afferent or an efferent nerve?

Answer 2

afferent (sensory)

-takes info from eye to the brain

Question 3

what different types of vision can we test in the optic nerve?

Answer 3

• direct response (pupils)
• RAPD
• peripheral
• central
• visual fields

Question 4

why is the cup in optic nerve important?

Answer 4

• if you can see a cup the nerve is not swollen

- how much tissue you have in longitudinally

Question 5

what would cause the nerve to go pale?

Answer 5

• demyelination

- ischaemia

Question 6

what are you looking for when looking at an image of an optic nerve?

Answer 6

• contour
• colour
• cup

Question 7

what does expansion of the cup mean?

Answer 7

-you’ve lost tissue

Question 8

how may the optic nerve present in glaucoma?

Answer 8

• asymmetry of optic nerve

- enlarged cup

Question 9

what is this?

Answer 9

-swollen disc

Question 10

what can cause swelling of the disc?

Answer 10

• people with raised ICP
• vascular ischaemia
• sometimes putting in dilating fluid

Question 11

how does a swollen disc present?

Answer 11

• indistinct contour

- colour varies, depends how long it’s been swollen for (may have haemorrhages or be pale)

Question 12

what should you rule out of you see a bilateral swollen disc (nerve)?

Answer 12

-raised ICP

Question 13

what is a disc drusen?

Answer 13

-usually lumps of calcium in the optic nerve

Question 14

how may disc drusen present?

Answer 14

• assymetry of optic disc

- swollen optic disc