Vestibular nystagmus: caused by movement or action in the vestibu1ar system (inner ear); four kinds: rotational, post-rotational, caloric and positional alcohol

Rotational nystagmus: occurs when a person is spun around

Post-rotational nystagmus: occurs when a person stops spiruring around

Caloric nystagmus: occurs when liquids of varying temperatures are put in opposing ear canals

Positional Alcohol Nystagmus: caused when alcohol alters the specific gravity of the blood versus the vestibular fluid

Neurological nystagmus: consisting of optokinetic, physiological and gaze nystagmus

Optokinetic nystagmus: occurs when eyes fixate on objects that suddenly move or when eyes view sharply contrasting images

Physiological nystagmus: naturally occurring to avoid eye strain; normally too subtle to observe

Gaze nystagmus: occurs when a person's eyes move from a center position; three types: horizontal, vertical and resting