primitive When we talk about primitive man, we're usually talking about cavemen and other people who existed before the advent of table manners, but if your uncle speaks grunts and chews with his mouth open, you could describe him as primitive too.
1 Optic neuritis is an inflammation of the optic nerve, often affecting young adults in one eye. 2  Optic neuritis is frequently associated with multiple sclerosis. 3  Other causes include infections, autoimmune disease, and injury to the optic nerve. The symptoms of optic neuritis include vision loss, reduced color vision, and pain on movement of the eye with recovery over weeks to a month, in most cases. 2  The diagnosis is made on the basis of the patient history and an examination by an ophthalmologist.
Inflammation of the optic nerve causes loss of vision, usually because of the swelling and destruction of the myelin sheath covering the optic nerve. The most common etiology is multiple sclerosis.