Optic Nerve Flashcards
Is the cat nerve head myelinated or unmyelinated?
Dog?
Cat - unmyelinated
Dog- myelinated
How do electrical currents pass down the optic nerve?
Optic nerve hypoplasia…
Uni/ bilateral?
Breed?
Vision?
What happens to the nerve head?
What is this similar to?
What is the difference between micropapilla and optic nerve hypoplasia?
Micropapilla doesn’t affect vision, disc small but normal.
Optic nerve hypoplasia does affect vision, disc small and grey
Where is an optic nerve coloboma normally?
When this is seen in a collie what is it part of?
6 o’clock
Collie eye Anomaly
What is wrong with this optic nerve?
Coloboma
What is Papilloedema?
Cause?
Uni/bilateral?
Visual deficits?
What is the other differential for Papilloedema?
Optic neuritis
What is optic neuritis?
Causes?
Uni/ bilateral?
What are the infectious causes of optic neuritis?
Clinical signs of optic neuritis?
Best way to diagnose optic neuritis?
Prognosis for immune mediated?
CT/ MRI
Reasonable but may require long term meds, GME not great
Can GME cause blindness?
Yes
What is the most common optic nerve tumour (although still v uncommon!) In;
Dogs?
Cats?
Dogs- Meningioma
Cats- lymphoma
What happens with optic nerve head atrophy?
