<unk> s <unk>  are rare benign tumors of the<unk>  nerve. 60-70% of cases occur in middle age females, and is more common in older adults (mean age 44.7 years). It is also seen in children, but this is rare. The tumors grow from cells that surround the<unk>  nerve, and as the tumor grows, it compresses the<unk>  nerve. This causes loss of vision in the affected eye. 
It is typically a slow growing tumor, and has never been reported to cause death. However, there is concern that the tumor can grow into the brain and cause other types of neurological damage. In some patients, the tumor grows so slowly that treatment is not necessary. Standard treatments are observation, surgery, radiation therapy, and combinations of the above.
Optic nerve sheath meningioma
Optic nerve glioma
Intraocular lymphoma
Aponeurosis
Labyrinthitis
Vestibular tumor
Septo-optic dysplasia
Meningioma