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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 ?
Nasdaq:CPTH), a provider of messaging software and services, has announced that Mediaset SpA, a broadcasting group, has deployed Memova Anti-Abuse to protect the users of its consumer e-mail service against malicious attacks - Jumpy.
Whether you consider Jumpy fortunate or oppressed is a good barometer of where you come down on the general animal rights debate.
When I was quite new in the company I did Aureole, the squatting, bouncing, jumpy solo--Dan Wagoner's original role--and I learned so much about dancing from doing that.
It is jumpy, association frequently degenerates into free-association, a torrent of references suggest imprecision of focus, and there is a lack of fastidiousness in the choice of authorities cited.
I plan to give you reasons for your jumpy fits/and facial tics.
In a second study, 12 right-handed men age 19 to 30 listened to a taperecorded list of novel word definitions, such as "a form of recreation for the jumpy - trampoline.
Theatr Clwyd JUMPY is a rollercoaster play about growing old and growing up.
It features a cattle dog named Jumpy, who responds to the gentle voice of his trainer with actions so precise, you'd think he was remote controlled.
Yes, there are some jumpy, zombie-focused moments but the rich range of conversations and dialogue choices also make you feel part of this painstakingly recreated world you are unfortunate enough to live in.
I was a bit jumpy with the swing and hit a few bad shots but came back nicely with a few birdies.
Peugeot is to offer medium-sized vans derived from its present Peugeot Expert and Citroen Jumpy models in the second quarter of 2013.
From missing pictures to dodgy prints and jumpy films, the complaints span three years.