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 ?
Mr Roberts, from Bangor, has also trained Rolo to herd ducks into a pen and jump through hoops.
If you want to report a crime, you have to jump through hoops to convince them that it is serious enough for them to attend - and, if it is serious, their first concern is for their own safety.
Users no longer have to jump through hoops to either deploy V5 or somehow integrate Virtual.Lab with their existing non-Dassault FE solvers.