Videonystagmography: A Clinical Tool for Diagnosis of Vertigo
Videonystagmography (VNG) is a clinical test method to evaluate inner ear and central (brain) motor functions about balance. VNG measures the movements of the eyes and gives information about the proper functioning of of inner ear vestibular (balance) function. The testing is comfortable for the patient. VNG test gives accurate, consistent, and reliable results.
VNG test is used for differential diagnosis between reasons of vertigo. It is performed to understand if a vestibular (inner ear) disease may be causing the balance problem (dizziness, vertigo, lightheadedness, etc) problem. It also gives clue about the side of the disease (right or left inner ear, or sometimes both ears). VNG test involves a group of tests that document the patient’s ability to follow a visual stimulus with his/her eyes and the capacity of the balance system to respond to this stimulus.
VNG test gives information about the functional capacity of each inner ear vestibuler system to understand the origin of the balance problem. Glasses that perform infra-red stimulus (infrared goggles) are worn by the patient during the procedure. The test does not involve any invasive procedure. The patient only wears goggles and the stimulus is given by the glasses. VNG test usually takes less than one hour. According to the specific patient’s needs, one to one and a half hour appointment is given by our clinic. The four main parts of the test are, ocular mobility, optokinetic nystagmus, positional nystagmus and caloric stimulation.
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