The video head impulse test (vHIT) is a high-frequency test of the vestibulo-ocular reflex (VOR). It tests the function of all six semicircular canals in the peripheral vestibular system and offers a supplementary assessment to rotary chair testing and caloric irrigation. Compared to the traditional clinical head impulse test (cHIT) that is conducted with direct observation of the eye, the vHIT can objectively detect and record overt and covert refixation saccades. You can document and use these measurements to identify any impairment or abnormality in the generated VOR.