Acute visual disturbance 2 - optic neuropathies Flashcards
optic neuropathy is
abnormality or damage to the optic nerves from any cause
symptoms of optic neuropathy
visual blurring or loss
or a change in colour vision
disc swelling looks like
is optic neuropathy common
no its not common but its not rare either
optic disc elevation may be
psuedopapilloedema or optic nerve head swelling
optic nerve head swelling may be categorised into
elevated ICP and Normal ICP
elevated ICP causes
papilloedema
which is bilateral optic nerve head swelling from elevated intracranial pressure
ONH swelling with normal ICP - is this unilateral or bilateral?
more commonly unilateral
is elevated ICP usually unilateral or bilateral
bilateral
Hx of optic nerve head swelling
variable visual change
pain (retro- or periocular)
systemic (paraesthesia, weakness etc)
headache, TVOs, diplopia -> raised ICP
age Hx
young - optic neuritis (+/- demyelination)
middle aged - non arteritic ischaemic optic neuropathy NAION (tends to happen in vasculopaths)
elderly - GCA
acute onset minutes/hours
NAION, GCA, trauma
subacute onset hours/days
optic neuritis
gradual onset (months/years)
toxic/nutritional/compressive
examination of papillodaema
loss of clarity of the margin of the optic nerve
drusen looks like
speckles
looks similar to hard exudate
age related
aetiology of GCA
systemic vasculitis of medium/large arteries
causes ischaemia of the optic nerve head