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There is an abnormality when the patient gazes to the right, in which the right eye abducted with an incomplete adduction of the left eye.
This video shows that when patient gazes to the his right the left eye lags behind as compared to the right eye.
The right eye which is the normal eye may have horizontal nystagmus.
This is called dissociation of conjugate eye movements.
The adduction of the affected eye can become normal when the comtralateral eye is covered.
Lesion are located at in the medial longitudinal fasiculus of the affected eye, in this video is the left eye.
Saccadic eye movement will be abnormal, pursuit saccadic eye movement.
Therefore have to check properly for the cerebellar abnormality
- weakness of ipsilateral adduction of the affected eye.