Fourth Nerve Palsy, also known as Superior Oblique Palsy, Limited Eye Movement and Trochlear Nerve Palsy, is a neurological defect that results from dysfunction of the fourth cranial nerve. It is the most frequent isolated cranial nerve palsy. The fourth cranial nerve gives impulses to one of the muscles on the surface of the eye which is called the superior oblique muscle. The main function of the superior oblique muscle is to move the eye downward. The main characteristic of Fourth Nerve Palsy is one eye is slightly higher than the other and this improves or worsens with different head positions.

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