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
References in periodicals archive ?
Moshammer says the findings decisively rule out both alternatives to rescattering--two or more electrons jumping ship simultaneously by the quantum-mechanical trick called tunneling or an atom spitting out additional electrons as an adjustment to the initial loss of an electron.
Kelvin Christopher James's first collection of short fiction, Jumping Ship and Other Stories, is a powerful, unsettling, and dramatic work which signals the arrival of a new figure among an important group of literary artists whose writings span the Caribbean and the United States.
MUCH LOVED cat Buxton "We've made a lead to stop him jumping ship in the night again.
But after months of criticism, he avoided being pushed out by jumping ship to French supermarket Carrefour in 2004.