<unk>  <unk>  is nystagmus (visible jerkiness in eye movement) produced when the head is placed in a sideways position.<unk>  occurs when the specific gravity of the membrane space of the semicircular canals in the ear differs from the specific gravity of the fluid in the canals because of the presence of<unk> .
Positional alcohol nystagmus
Amaurotic nystagmus
Bruns nystagmus
Flicker vertigo
Alternobaric vertigo
Pendular nystagmus
Persistent pupillary membrane
Argyll Robertson pupil