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convergence

convergence (kon-ver´jens)

1. The tending of two or more objects toward a common point. 2. The direction of the visual lines to a near point. [L. con-vergere, to incline together]
accommodative c. the meter angle of c. expressed in diopters; equal to the product of the meter angles of c. times the interpupillary distance measured in centimeters.
amplitude of c. the distance between the near point and far point of c.range of c;
angle of c. the angle that the visual axis makes with the median line when a near object is viewed.
far point of c. the point to which the visual lines are directed when c. is at rest.
near point of c. the point to which the visual lines are directed when c. is at its maximum.
negative c. the slight divergence of the visual axes when c. is at rest, as when observing the far point or during sleep.
positive c. inward deviation of the visual axes even when c. is at rest, as in cases of convergent squint.
range of c. amplitude of c
unit of c. See meter angle.

 

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