Clinical examination will show an abnormal optic disc, either swollen or atrophic. Optociliary shunt vessels may be seen; the combination of these with progressive visual loss and optic disc atrophy is known as the Hoyt-Spencer triad. Visual acuity is usually but not always reduced. When<unk>  is suspected, MRI of the brain or orbits should be performed. This will usually show characteristic findings and confirm the diagnosis.
Optic nerve sheath meningioma
Optic nerve glioma
Intraocular schwannoma
Optic nerve tumor
Vestibular schwannoma
Labyrinthine fistula
Intraocular lymphoma
Coloboma of optic nerve