jump

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Related to jumps: jumpstart, Jump Street, JMPS

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 ?
Measurements that will appear include: jump height, jump count and the new Jump Rate(TM) feature.
A special jump platform has been set up from the 99th floor of Princess Tower, the tallest residential tower in the region.
Turning the city's skyline into a playground, a team of daredevil jumpers will plunge from the 99th floor of the Princess Tower as part of a global dream jump happening for the first time outside Europe.
Detailed evaluation of the jumps showed that frequencies above and below the resonance provided optimal jumping - and additional analysis revealed what the researchers called the "stutter jump.
DAREDEVIL motorcyclist Jason Rennie plans to jump further than American idol Evel Knievel ever did.
Former Grand National winning jockey and current Ludlow clerk of the course Bob Davies said: "This all started some years ago when a prominent amateur jockey of the day had trouble at these particular jumps and wanted them abolished.
Jack jump: Land on alternate jumps with your legs apart and then together, and so on.
You jump more and articulate more because you're using movements that are a little freer.
A study measuring the vertical jump velocity after a warm-up--with and without stretching--showed that 55% of the participants had a lower velocity after stretching (7.
The investigator continues this process of tracing back the hacker's jumps.
Stahler says his "crude calculation" indicates the brightness jump occurs over a mere century.