What is Videonystagmography (VNG)?
VNG consists of a battery of tests designed to assess inner ear and central motor functions. At Coastal Ear, Nose, and Throat, the battery consists of three sections:
Central vestibulo-ocular function
During this section of the test, you will be asked to track a dot’s movements on a video screen. Infrared goggles will be able to track your eye movements, assessing speed and accuracy of response. Abnormalities in this section of the testing are often consistent with problems of higher brain functions.
The positional testing section will utilize the infrared goggles as well, however, you will not be able to see. You will be asked to place your head and body in several different positions, such as lying down and turning your head, and your eye movements when in these positions will be tracked. Abnormalities in this section are often consistent with peripheral issues, meaning that the ears may not be working effectively together to control our body’s movements.
The last section of the VNG is designed to assess the function of each ear individually. As in the positional section, infrared goggles will be worn but you will be unable to see. The audiologist will be presenting temperature-controlled air into each ear for approximately one minute. These ear irrigations will most likely result in dizziness, lasting approximately 1-2 minutes in duration. We will be measuring your eye movements in reaction to getting dizzy and comparing responses between ears. In total, there will be four irrigations, which is two for each ear.
Upon completion of the VNG, the audiologist will review the data and provide an analysis to one of our medical doctors. Your doctor will describe the cause of your dizziness and appropriate treatment plan.