Assessing Optic Disc and Visual Fields

Question 1

which bone is the optic canal found in?

Answer 1

sphenoid bone

Question 2

normal size of the optic disc?

Answer 2

0.7-2.0mm (1.5mm average)

Question 3

what are the three C’s when assessing the optic disc?

Answer 3

contour
colour
cup

Question 4

contour of the optic disc

Answer 4

borders are well-defined
swollen in papilloedema
margins can blur due to drusen

Question 5

colour of optic disc

Answer 5

neuro-retinal rim is orange pink with a central pale cup

Question 6

when does the neuro-retinal rim become pale?

Answer 6

glaucoma
optic neuritis
ischaemia
compressible lesion

Question 7

what is the normal ratio of the up to disc?

Answer 7

0.3

Question 8

ISNT rule for cup border

Answer 8

inferior (thickest)
superior
nasal
temporal

Question 9

causes of optic neuropathy

Answer 9

NIGHT TICS
neuritis
ischaemia
granulomatous
hereditary
traumatic 
toxic
irradiation
compression