convergence nystagmus
Last reviewed 07/2021
Convergence nystagmus consists of slow abduction of the eyes, followed by rapid adduction.
There is often an associated rhythmical retraction of the eyes termed nystagmus retractorius.
The cause is a lesion in the ventral midbrain, usually a tumour or infarct, and is usually associated with other features of Parinaud's syndrome.