What is nystagmus?
This is an involuntary rapid tracking movement of the eyes. It usually affects both eyes, and is often exaggerated or stopped by looking in a particular direction.
The eyes may move from side to side (horizontal nystagmus), up and down (vertical nystagmus), circular (rotatory nystagmus) or a combination of these.
The most common types are motor and sensory nystagmus:
- Motor nystagmus is usually hereditary and present shortly after birth
- Sensory nystagmus is an acquired condition usually beginning in infancy
If the underlying cause is known it may be treatable.
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