A NVG test, more accurately referred to as Videonystagmography (VNG), is a test designed to measure involuntary eye movements known as nystagmus.
Understanding Videonystagmography (VNG)
What is Nystagmus?
Nystagmus involves repetitive, uncontrollable eye movements. These movements can occur in various directions:
- Side to side
- Up and down
- Circular
Nystagmus can vary in speed and pattern, ranging from slow and steady to rapid and jerky.
Why is VNG Important?
VNG is used to identify and assess problems with the inner ear or the neurological pathways that control balance and eye movements. These issues can lead to:
- Vertigo (a sensation of spinning)
- Dizziness
- Balance problems
How VNG Works
A VNG test typically involves the following procedures:
- Eye Movement Tracking: Special goggles are placed on the patient's eyes to record their eye movements. These goggles use cameras and computer software to track even the smallest movements.
- Various Tests: The patient performs various tasks such as:
- Following visual targets.
- Moving their head in different positions.
- Being exposed to different visual stimuli.
- Data Analysis: The recorded data is analyzed to determine if there are any abnormalities in the eye movements. These abnormalities can provide clues about the underlying cause of the balance issues.
Summary of VNG
| Feature | Description |
|---|---|
| Purpose | Measures involuntary eye movements (nystagmus) to assess balance and inner ear problems |
| Eye Movement | Includes side-to-side, up-and-down, and circular movements |
| Testing | Involves tracking eye movements during various visual and head position tests |
| Results | Helps diagnose causes of vertigo, dizziness, and balance disorders |
