What is Optic Neuritis?

OPTIC NEURITIS
Coronal T1 contrast-enhanced fat suppressed magnetic resonance imaging showing enhancement of the left optic nerve (arrow) which is typical of optic neuritis. Optic neuritis: Dooley MC, Foroozan R - Journal of ophthalmic & vision research (2010). Not altered. CC.

Optic neuritis is vision change or loss due to demyelinization of the optic nerve. Optic neuritis is classically associated with multiple sclerosis.