VENG (VideoElectronystagmography) testing is comprised of a series of tests that look for signs of vestibular dysfunction by measuring eye movements using infrared technology. VENG is the new standard in balance testing because it's one of the only tests that can measure vestibular loss bilaterally rather than unilaterally, resulting in more accurate test results. The testing is noninvasive and more comfortable to the patient.
The eyes are inner ear work together to send signals to the brain about the body's position. The brain uses this information in conjunction with sensory input from the body's muscles to orient the body and maintain balance. VENG testing examines nystagmus (eye movement) to assess the relationship between eye movement and the inner ear.
In VENG testing the patient wears goggles and the eye movements are recorded by an infrared camera. The patient will be asked to follow objects that move erratically, move consistently, or remain stationary. The eye movements are recorded and analyzed by VENG software. Difficulty following visual targets could indicate a neurological problem.
VENG testing includes nystagmus testing, optokinetic and positional. In optokinetic nystagmus testing the patient will be asked to view a large image that continually moves. This test tracks the ability of the eyes to remain on the object; slowness in tracking may indicate a neurological problem.
Positional nystagmus testing entails positioning the head and body to check the condition of the endolymph fluid in the inner ear. If otoconia are found to be suspended in the fluid this could cause a disturbance in the inner ear function.
In caloric testing one or both of the inner ears are stimulated with bursts of air, or cold or warm water. Eye movements are monitored to determine if one or both ears sense the stimulation. This test is used to conclude if vestibular dysfunction is unilateral or bilateral.