A VNG, or videonystagmography, medical test refers to a set of technologies used in testing the inner ear and the functionality of central motor functions, according to the National Dizzy and Balance Center. VNG testing is used in determining whether a vestibular disease may be causing a balance or dizziness problem.
The VNG test is one of the only ones available that can decipher between a bilateral and a unilateral vestibular loss, according to the National Dizzy and Balance Center. The word vestibular is used in reference to inner ear.
VNG testing is a series of tests designed to document a patient’s ability to follow objects with her eyes and how well the patient’s eyes respond to information from the vestibular system, explains the National Dizzy and Balance Center. This test measures movement directly through infrared cameras. This test also looks through the functionality of each ear, to determine if the dizziness or imbalance problem is caused by vestibular deficit.
VNG testing is non-invasive, , according to the National Dizzy and Balance Center. During this procedure, infrared goggles that record movements of the eyes during testing are put around the eyes. It is a four-part test, which includes an ocular mobility test, optokinetic nystagmus test, positional nystagmus test and caloric testing. All these tests are designed to determine inaccuracy or slowness in perception, speed and color.