Bruns nystagmus is an unusual type of bilateral nystagmus most commonly occurring in patients with cerebellopontine angle tumours.

Further causes, besides an aneurysm, multiple sclerosis or cerebellopontine angle tumor, include: a posterior fossa tumor, any other expanding lesion or even brainstem diseases from strokes.

He also did the first operation for complete removal of a cerebellopontine angle tumor, as well as being one of the first surgeons to perform a radical mastoidectomy with ligation of the jugular vein.