It is a set of tests that evaluate balance organs, brain and cerebellum functions by measuring eye and head movements by wearing glasses with a computer system and a camera on the eye with a special device.
It is important to determine the lesion side and location in all patients presenting with dizziness (vertigo), feeling of imbalance (dizziness), feeling of drowsiness (unsteadiness) or ataxia.
VNG Tests Consist of These Subtitles:
- -Gaze Tests: It is performed to determine the presence of eye beats (nystagmus) during a visual stimulus.
- -Skew Deviation tests
- -Head Shaking Test: The test, which is performed by closing the test glasses (goggle) on the patient’s eyes, is performed by the audiologist by shaking the patient’s head to the right and left at the same speed. The clinician asks the patient to stop the nodding and not close their eyes. The resulting eye beats (nystagmus) help us in the diagnosis of patients with peripheral vestibular dysfunction.
- -Spontaneous Nystagmus Test: It is one of the important signs of vestibular dysfunction. In this test, the goggle attached to the patient is closed. Spontaneous blinks in the dark without any visual stimuli. It helps us in the diagnosis of patients with peripheral vestibular dysfunction.
- -Saccade Test: It is used to show the adaptation of the Central Nervous System to rapid eye movements.
- -VVOR and VORS Tests are available.
VNG tests specifically answer the question of whether the disease originates from the inner ear or the central nervous system (cerebellum).