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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.
The pages are visually jumpy and attention grabbing with small reproductions, paragraphs in boxes about Cassatt's evolution, journalistic comments by a student with photographs, and cartoons with speech balloons.
Both offensive lines have every right to be jumpy when lined up opposite Sunday's tough defences and pre-snap penalties are being called at the usual rate.
Richards describes the Virgin Mary as "a pretty special Sheila" and says that King Herod was "as jumpy as a wallaby on hot rocks", so he gathered together a bunch of smart blokes with "more degrees than a thermometer".
Blair, ever the control freak, is growing jumpy. And with good reason: Blair is reputedly worded that Brown is more interested in replacing him than in replacing the pound with the euro.
For Europeans, this is still an artificial process and one that makes them jumpy. Euro or no euro, Europe is used to thinking small.
The manifolds will be shipped to the PSA Peugeot-Citroen engine plant in Tremery, France to be used in the Peugeot 206,306 and small utility vans Partner and Expert; the Citroen Xsara and small utility vans Bellingo, Jumpy and C15; and the Fiat small utility van Scudo.
Caffeine (found in chocolate and many soft drinks) is a more likely cause of restless, jumpy, or "hyper" behavior.
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.
And it contains one of Jordan's anthems, "I Must Become a Menace to My Enemies." Like her anti-pacifism poem, this one puts her oppressors--and bullies everywhere--on guard: "Be afraid./I plan to give you reasons for your jumpy fits/and facial tics." But even in this poem she makes room for love and nature, "impulse and realities/ (the blossoming flamingos of my/wild mimosa trees)."