Duction
Duction
Duction (/dʌkʃən/) is a term used in Ophthalmology to describe the movement of a single eye in one of the six primary directions of gaze. It is a fundamental concept in understanding eye movements and diagnosing ocular motility disorders.
Etymology
The term 'Duction' is derived from the Latin word 'ducere', which means 'to lead'. In the context of ophthalmology, it refers to the leading or guiding of the eye in a particular direction.
Types of Duction
There are six types of ductions, each corresponding to one of the six primary directions of gaze:
- Adduction: Movement of the eye towards the midline.
- Abduction: Movement of the eye away from the midline.
- Supraduction or Elevation: Upward movement of the eye.
- Infraduction or Depression: Downward movement of the eye.
- Intorsion or Incycloduction: Rotational movement of the eye towards the nose.
- Extorsion or Excycloduction: Rotational movement of the eye away from the nose.
Related Terms
- Version: Simultaneous movement of both eyes in the same direction.
- Vergence: Simultaneous movement of both eyes in opposite directions.
- Strabismus: A condition in which the eyes do not properly align with each other when looking at an object.
See Also
External links
- Medical encyclopedia article on Duction
- Wikipedia's article - Duction
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