Videonystagmography (VNG) testing measures how well a person can follow objects with his or her eyes and how well the person’s eyes respond to vestibular system information. A VNG tests central motor and inner ear functioning. This testing can determine if the cause of dizziness and balance problems is inner ear disease, as opposed to something else, such as anxiety or low blood pressure. VNG is considered to be more comfortable, accurate and consistent than electronystagmography (ENG) testing.