<unk>  = involuntary eye movement
The semicircular canals of the vestibules and the extraocular muscles of the eye function together physiologically to help control gaze when the head is in motion<unk>  is an aberration in this stabilization of the ocular muscles when the head is in motion
Nystagmus
Optic nerve hypoplasia
Internuclear ophthalmoplegia
Macular disease
Ataxia
Noonan syndrome
Ataxia 
Head trauma, tympanic membrane rupture