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vergence

9.9

The movement of both eyes in opposite directions to keep a single image

noun
/ˈvɜrdʒəns/

Specialized

: convergencia

When reading a book, vergence helps keep both eyes aligned to avoid double vision.

Examples

So a lot of the feedback I'd say is in eye tracking and ideally vergence tracking, which is again, how your eyes converge.
During the eye exam, the doctor checked my vergence to ensure my eyes worked together correctly.
In order to maintain a clear image, the brain relies on the vergence of the eyes to adjust for distance.

How Convergent

convergence

36 6.5

vergence

Specialized

9.9

divergence

2 6.7

Surface Forms

vergence singular

vergences plural

Morphology

vergence = verge (semi-transparent) = verge + ence

Formed from 'verge' + '-ence' and specialized to refer to binocular eye movements; morphological relation is clear but the specific physiological meaning is technical.

Etymology

Vergence comes from the Latin vergere, 'to turn', and is the same root as converge and diverge. For the eyes, vergence means how much the two eyes turn toward or away from each other to keep one clear image.