A unit of convergence equal to the angle between the line of sight of either eye and the median line passing between them when they are focused on a point on that line one metre away.
Origin
Late 19th century. After German Meter-winkel.
Definition of metre-angle in US English:
metre-angle
(USmeter-angle)
noun
Optics
A unit of convergence equal to the angle between the line of sight of either eye and the median line passing between them when they are focused on a point on that line one metre away.