Videonystagmography Testing (VNG): VNG technology is utilized for testing the inner ear and central motor functions. It is considered the new standard for testing the functions of the inner ear. VNG testing is a series of tests designed to document the ability to follow visual objects with the eyes. It also measures the functionality of each ear and can determine if a vestibular deficit may be causing dizziness or balance problems. It is non-invasive and takes about 1.5 hours.