A duction is an eye movement involving only one eye. There are generally six possible movements depending upon the eye's axis of rotation:
- Abduction refers to the outward movement of an eye.
- Adduction refers to the inward movement of an eye
- Supraduction / sursumduction / elevation
- Infraduction / deosumduction / depression
- Incycloduction / intorsion
- 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.
The anesthetized conjunctiva is grasped with forceps and an attempt is made to move the eyeball 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 eyeball
References
Duction Wikipedia(Text) CC BY-SA