When the optic nerve gets inflammed it's called optic neuritis. It can be brought on by in infection (viral) or from an auto immune disease.
Symptoms of optic neuritis includes:
-vision loss
-most experience pain while moving the eye
The first symptom that may occur in about 20 percent of people who are going to get Multiple Sclerosis is optic neuritis.
MRI is the better screening tool to use to diagnose optic neuritis.
Generally optic neuritis resolves itself, but steroids may be used for treatment of the inflamation.
In about two to six months people return to their normal vision.
Images obtained from:
http://www.emedicine.com/oph/topic186.htm
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