When I last lost my eye sight, the doctor told me that I had optic neuritis . I never heard of it, but thought it was a word associated to eye sight loss.
I researched it and learned that it's an inflammation of the optic nerve, which is a bundle of nerve fibers in your eye that transfers visual information to your brain. Pain and temorary vision loss are common symptoms of optic neuritis. I remember in addition to the loss of eye sight, I did experience pain as well.
Optic neuritis is associated with development due to an autoimmune disorder, namely multiple sclerosis and if someone experiences the symptoms of optic neuritis, more than likely the doctor will want to test the patient for multiple sclerosis.
Like myself, people who experience optic neuritis, can fully recover in getting their eye sight back with the aid of taking steroids.