jump

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jump

The displacement of the image of an object occurring when viewing across the borderline between two portions of different power in a bifocal or trifocal lens. The jump is eliminated by placing the optical centres on the dividing line; the lens is then called a no jump bifocal (e.g. a monocentric bifocal with a straight dividing line) (Fig. J1). Syn. image jump; prismatic jump. See monocentric.
Fig. J1 Image jump upward caused by the segment of a bifocal lens, as the direction of gaze is lowered across the dividing lineenlarge picture
Fig. J1 Image jump upward caused by the segment of a bifocal lens, as the direction of gaze is lowered across the dividing line
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Ignatieff acknowledges that the Persian Gulf, "because it has so much of the world's proven oil reserves," serves as "the empire's center of gravity." But then he leaps to the conclusion that "the case for empire is that it has become, in a place like Iraq, the last hope for democracy and stability alike."
He correctly observes that no great society in history has been a complete social democracy, but from this he leaps to the conclusion that every successful society must have a quasi-hereditary ruling class-he doesn't explore the obvious possibility of a democratically constituted (and democratically inclined) leadership, even though he has seen one with his own eyes, as his fond references to the multiclass, multiethnic, very successful World War II armed forces, in which he served, demonstrate.
As Deano leaps to the conclusion the search for his dad can begin there, Carly gently points out what the policeman isn't saying - that Kevin could have killed himself.