Optic neuritis is an inflammation that damages the optic nerve, a bundle of nerve fibers that transmits visual information from your eye to your brain. Pain and temporary vision loss in one eye are common symptoms of optic neuritis.Optic neuritis usually affects one eye. Optic neuritis is linked to multiple sclerosis (MS), a disease that causes inflammation and damage to nerves in your brain and spinal cord. Signs and symptoms of optic neuritis can be the first indication of multiple sclerosis, or they can occur later in the course of MS. Besides MS, optic neuritis can occur with other infections or immune diseases, such as lupus.

Symptoms

• Pain.
• Vision loss in one eye.
• Visual field loss.
• Loss of color vision.
• Flashing lights.

Causes:

• Multiple sclerosis
• Neuromyelitis optica
• Infections. 
• Other diseases. 
• Drugs.