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Duction

Anatomical term for eye movements

Summary

Anatomical term for eye movements

A duction is an eye movement involving only one eye. 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.

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

References

  1. Kanski, JJ. ''Clinical Ophthalmology: A Systematic Approach.'' Boston:Butterworth-Heinemann;1989.
  2. [http://www.biology-online.org/dictionary/Forced_duction Forced duction - definition from Biology-Online.org]
  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
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

eye ophthalmology
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