Hyperfunction of the superior oblique muscle

The movement of the eye caused by the superior oblique oculomotor muscle is downwards and inwardly (nasally).

In cases of overaction of the superior oblique muscle, the eye making the adduction (moving toward the nose) is simultaneously also doing a down shift.

Often the disease is accompanied by the phenomenon A, which means that at the upper gaze position the eyes converge and diverge in the lower gaze
position(forming a substantially Greek "Λ" or "A").

Hyperfunction of the superior oblique muscle: When the child is looking towards his right, his left eye is performing an additional down turn. Similarly, when looking towards his left, his right eye is directed downwards.

As the hyperfunction of the inferior oblique muscle so does the upper oblique muscle often accompany a horizontal strabismus, which must also be treated and in the same operation.

Hyperfunction of the superior oblique muscle: When the child is looking towards his right, his left eye is performing an additional down turn. Similarly, when
looking towards his left, his right eye is directed downwards.