Optic neuritis (ON) is an inflammation that damages your optic nerve. It can cause vision loss and pain when you move your eyes. As the inflammation goes away, your symptoms usually get better.

The optic nerve has been known to contain both sensory and motor fibres since the work of Bethe 1, who suggested a purely motor function for the oculomotor nerve.

He had not been given any systemic medications and had no history of recent infectious or toxic exposure ... swollen optic discs with edema of the nerve fiber layer that obscured their margins ...