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 ?
En el caso del primero, la JLCA condeno a la Femexfut a reinstalarlo y no senalo un plazo para hacerlo.
The quality of this conversion is very high (often upwards of 90 percent), but some modifications are required after the JLCA finishes.
Varios laboralistas senalan que los autores intelectuales de dicho decreto son Tomas Natividad, de la Coparmex, y Guadalupe Guerrero, secretaria general de asuntos colectivos de la JLCA y quien -segun el personal de esa dependencia consultado y que pidio el anonimato- es la "mandamas" de la Junta desde hace muchos anos, sin importar quien aparezca como presidente de la misma.
Entre 2006 y lo que va de este ano declaro ante la JLCA haber realizado mil 261 revisiones contractuales y dice representar a 32 mil 319 trabajadores.