Vergence
Vergence
Vergence (/ˈvɜːrdʒəns/) is a term used in optometry and ophthalmology to refer to the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.
Etymology
The term 'vergence' is derived from the Latin word 'vergere', which means 'to bend' or 'turn'. It was first used in the context of eye movements in the late 19th century.
Types of Vergence
There are two main types of vergence movements: convergence and divergence.
- Convergence is the simultaneous inward movement of both eyes towards each other, usually in an effort to maintain single binocular vision when viewing an object. This is generally stimulated by an object moving towards the viewer or by the viewer's gaze shifting to a nearer object.
- Divergence is the simultaneous outward movement of both eyes away from each other, usually in an effort to maintain single binocular vision when viewing an object. This is generally stimulated by an object moving away from the viewer or by the viewer's gaze shifting to a more distant object.
Related Terms
- Accommodation (eye): The process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies.
- Binocular vision: The ability to maintain visual focus on an object with both eyes, creating a single visual image.
- 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 Vergence
- Wikipedia's article - Vergence
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