left fourth nerve palsy

For acquired fourth nerve palsy, see fourth nerve palsy

Congenital fourth nerve palsy is a condition present at birth characterized by a vertical misalignment of the eyes due to a weakness or paralysis of the superior oblique muscle.

Other names for fourth nerve palsy include superior oblique palsy and trochlear nerve palsy. When looking to the right/left the nerve/muscle isn't strong enough or is too long and the eye drifts up.