A duction is an eye movement involving only one eye.Kanski, JJ. Clinical Ophthalmology: A Systematic Approach. Boston:Butterworth-Heinemann;1989. 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 / deorsumduction / 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.Forced duction - definition from Biology-Online.org
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.Kunimoto D, Kanitkar K & Makar M. The Wills Eye Manual. Office and Emergency Room Diagnosis and Treatment of Eye Disease. Fourth Edition. Lippincott Williams & Wilkins; 2004
Notes
See also Extraocular muscles Eye examination Vergence Version (eye)