# Duction

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Duction
> Markdown URL: https://mediated.wiki/source/Duction.md
> Source: https://en.wikipedia.org/wiki/Duction
> Source revision: 1239262834
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Anatomical term for eye movements

"-duction" redirects here. For the terms of logic ending in this suffix, see [inductive reasoning](/source/Inductive_reasoning).

A **duction** is an [eye movement](/source/Eye_movement_(sensory)) involving only one [eye](/source/Human_eye).[1] There are generally six possible movements depending upon the eye's [axis of rotation](/source/Axis_of_rotation):

1. [Abduction](/source/Abduction_(physiology)) refers to the outward movement of an eye.

1. [Adduction](/source/Adduction) refers to the inward movement of an eye

1. Supraduction / sursumduction / elevation

1. Infraduction / deorsumduction / depression

1. Incycloduction / intorsion

1. 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 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.[3]

## Notes

1. **[^](#cite_ref-1)** Kanski, JJ. *Clinical Ophthalmology: A Systematic Approach.* Boston:Butterworth-Heinemann;1989.

1. **[^](#cite_ref-2)** [Forced duction - definition from Biology-Online.org](http://www.biology-online.org/dictionary/Forced_duction)

1. **[^](#cite_ref-3)** 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

## See also

- [Extraocular muscles](/source/Extraocular_muscles)

- [Eye examination](/source/Eye_examination)

- [Vergence](/source/Vergence)

- [Version (eye)](/source/Version_(eye))

---
Adapted from the Wikipedia article [Duction](https://en.wikipedia.org/wiki/Duction) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Duction?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.