Vestibular Autorotation Test (VAT)
The Vestibular Autorotation Test (VAT) is a computerized test of head and eye movements to evaluate both the high frequency horizontal and vertical vestibulo-ocular reflex (VOR). The VOR system stabilizes fixation of the eyes during head rotation by causing the eyes to move in the opposite direction of the head motion. The main purpose of the VOR is to allow clear vision during movement by sending signals to move the eye muscles to compensate for the small rapid head movements that occur in everyday life. However, if the speed or timing is off, even slightly, vision is distorted because of apparent movement of the visual fields.
VAT is often the first screening test a patient receives who complains of dizziness or balance problems.