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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 ?
But after a while he decided that Jumpy was an idiot.
A similar mechanism for examining and dealing with past military atrocities could also help appease an increasingly jumpy armed forces.
Caffeine is a mild stimulant that can make you feel restless, jumpy, or hyper (hyperactive).
Treva Offutt's solo to "Fly Away Home" is a carefully balanced blend of sustained, lyrical movement and jerky, jumpy phrases.
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.
These developments may lead to more uncertainty in an increasingly jumpy market, placing added impetus for Fitch's newly installed Recovery Ratings to help provide a better reflection of market sentiment.
The France-based automaker will provide Toyota with versions of its Peugeot Expert and Citroen Jumpy medium size vans from mid 2013.
From missing pictures to dodgy prints and jumpy films, the complaints span three years.
It's strong and everything you would expect, opening with Don't F***g Tell Me What To Do, a jumpy electro track with lyrics full of frustreria.
It's Friday night at the Natural History Museum, and a 40,000-year-old ground sloth is in full roar, joined by a herd of pint-size dinosaurs and horses in a jumpy ``Lion King''-style polyphonic orgy, dreamt up by those 21st-century wildcats Ozomatli.
You have 50,000 Geordies packing the ground every home game and they are jumpy because a trophy has not been won for donkey's years.
If they are just good friends, why are they both so jumpy and act like they have something to hide.