Duction

A duction is an eye movement involving only one eye^[1]. There are generally six possible movements depending upon the eye's axis of rotation:

1. Abduction refers to the outward movement of an eye.
2. Adduction refers to the inward movement of an eye
3. Supraduction / sursumduction / elevation
4. Infraduction / deorsumduction / depression
5. Incycloduction / intorsion
6. Excycloduction / extorsion

Forced duction test

The forced duction test is performed in order to determine whether the absence of movement of the eye is due to a neurological disorder or a mechanical restriction^[2].

The anesthetized conjunctiva is grasped with forceps and an attempt is made to move the eye ball in the direction where the movement is restricted. If a mechanical restriction is present, it will not be possible to induce a passive movement of the eye ball^[3].

This test is semi invasive.

Notes

See also

• Extraocular muscles
• Eye examination
• Vergence
• Version (eye)

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