nystagmus
/nɪˈstæɡməs/
noun
- A condition of rapid, involuntary eye movements, often side-to-side or up-and-down.
- The optometrist diagnosed him with nystagmus after observing his eye movements.
- Nystagmus can be caused by inner ear problems or certain neurological conditions.
- People with nystagmus may have trouble reading or maintaining steady vision.