duction duction 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. notes kanski, jj. clinical ophthalmology: a systematic approach. boston:butterworth-heinemann;1989. forced duction - definition from biology-online.org 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