Head-impulse test	The patient should focus on a fixed target. Turn patient's head laterally 10 to 20 degrees with high acceleration while observing the eyes. A saccadic eye movement is indicative of a peripheral cause.
Nystagmus test	The patient should look with a sustained gaze in a left or right direction. Do not have the patient fixate on a target. The fast beat of the nystagmus that changes direction with change ingaze (refixation), vertical nystagmus, or torsional nystagmus is consistent with a central nervous system pathology.
Test of skew	The patient should focus on a fixed target, typically the examiner's nose. Perform cover-uncover test on each eye. Any upward or downward gaze correction is indicative of central nervous system pathology.