Internuclear ophthalmoplegia is a physical finding, or sign, that is a particular form of ophthalmoparesis. It can affect either the right or left eye. It is a disorder of conjugate lateral gaze. The affected eye shows impairment of adduction. The partner eye diverges from the affected eye during abduction, producing diplopia; during extreme abduction, compensatory nystagmus can be seen in the partner eye.
See more at Wikipedia.org...