vergencen.
/ˈvəːdʒəns/ 1. Ophthalmology. The simultaneous movement of both eyes towards or away from one another, as when they focus on a point that is nearer or farther away.
ΘΚΠ
the world > life > the body > external parts of body > head > face > eye > [noun] > movements of eye
rollinga1500
volubility1603
flexion1626
roving1658
eye-rolling1837
run1837
sursumversion1897
extorsion1899
vergence1902
eye-roll1928
1902 E. C. Ellett in Jrnl. Amer. Med. Assoc. 18 Oct. 969/2 I would suggest as a temporary table at least, a sort of composite arrangement, as follows: Movements of the visual axis... Associated disjunctive movements (vergences)..convergence..supervergence.
1940 F. B. Chavasse in Ridley & Sorsby Mod. Trends Ophthalmol. xxvi. 280 By growth, extension, and refinement of this reflex is developed the proper vergence (notably convergence) of the eyes upon (say) the prey.
1979 Sci. Amer. Jan. 88/1 Abrupt target jumps generate two types of eye movements: slow, smooth vergence eye movements..and sharp, rapid saccadic eye movements.
2. Geology. [ < German vergenz (H. Stille 1930, in Nachrichten von d. Ges. d. Wissensch. zu Göttingen, Math.-Physik. Klasse iii. 380).] The direction in which a fold is inclined or overturned.
ΘΚΠ
the world > the earth > structure of the earth > structural features > fold or dip > [noun] > direction of fold
vergence1960
1960 Trans. Edinb. Geol. Soc. 18 51 Isoclinal recumbent folds with an average trend ENE-WSW; vergence SSE to NNW. [Note] The authors use the term ‘vergence’..to indicate the direction of overturning of folds.
1978 Nature 7 Dec. 604/1 At the northern apex of the Tyrrhenian Sea, two mountain chains face each other displaying opposite vergence: the Corsican alpine chain and the Northern Apennines.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1902