The optic nerve carries images of what the eye sees to the brain. When this nerve become swollen or inflamed, it is called optic neuritis. It may cause sudden, reduced vision in the affected eye.
Retro-bulbar neuritis; Multiple sclerosis - optic neuritis; Optic nerve - optic neuritis
The exact cause of optic neuritis is unknown.
The optic nerve carries visual information from your eye to the brain. The nerve can swell when it becomes suddenly inflamed. The swelling can damage nerve fibers. This can cause short or long-term loss of vision.
Conditions that have been linked with optic neuritis include:
- Autoimmune diseases, including lupus, sarcoidosis, and Behçet disease
- Cryptococcosis, a fungal infection
- Bacterial infections, including tuberculosis, syphilis, Lyme disease, and meningitis
- Viral infections, including viral encephalitis, measles, rubella, chickenpox, herpes zoster, mumps, and mononucleosis
- Respiratory infections, including mycoplasma pneumonia and other common upper respiratory tract infections
- Multiple sclerosis