| vergence | A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence. Origin: L. Vergo, to incline, to turn (05 Mar 2000) |
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| vergence of lens | The reciprocal of the principal focal distance used as a measure of the divergence or convergence of parallel rays. (05 Mar 2000) |
| prism vergence test | Measurement of the amplitude of fusion by placing prisms of gradually increasing power in the direction tested until diplopia occurs. (05 Mar 2000) |
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