Assessing Optic Disc and Visual Fields Flashcards
1
Q
which bone is the optic canal found in?
A
sphenoid bone
2
Q
normal size of the optic disc?
A
0.7-2.0mm (1.5mm average)
3
Q
what are the three C’s when assessing the optic disc?
A
contour
colour
cup
4
Q
contour of the optic disc
A
borders are well-defined
swollen in papilloedema
margins can blur due to drusen
5
Q
colour of optic disc
A
neuro-retinal rim is orange pink with a central pale cup
6
Q
when does the neuro-retinal rim become pale?
A
glaucoma
optic neuritis
ischaemia
compressible lesion
7
Q
what is the normal ratio of the up to disc?
A
0.3
8
Q
ISNT rule for cup border
A
inferior (thickest)
superior
nasal
temporal
9
Q
causes of optic neuropathy
A
NIGHT TICS neuritis ischaemia granulomatous hereditary traumatic toxic irradiation compression
