Fourth nerve palsies effect the superior oblique muscle (trochlea) only. The main difficulty is diplopia when trying to read. The deviation or hypertropia is most noticeable on downward gaze.
Often there will be a head tilt
Fourth nerve palsies effect the superior oblique muscle (trochlea) only. The main difficulty is diplopia when trying to read. The deviation or hypertropia is most noticeable on downward gaze.
Often there will be a head tilt