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Vergency vs Vergence - What's the difference?

vergency | vergence |

As nouns the difference between vergency and vergence

is that vergency is the act of verging or approaching; tendency while vergence is (physics) a measure of convergence or divergence of rays.

vergency

English

Noun

(vergencies)
  • The act of verging or approaching; tendency.
  • The reciprocal of the focal distance of a lens, used as a measure of the divergence or convergence of a pencil of rays.
  • * 1863 , The Civil Engineer and Architect's Journal
    • When, by the pencil becoming oblique to the surface, the vergency produced on the pencil becomes changed, the primary and secondary focal points, V and H, separate

    vergence

    English

    Noun

    (wikipedia vergence) (en noun)
  • (physics) A measure of convergence or divergence of rays
  • (physiology) The simultaneous turning of both eyes when focusing