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 ?
The aim of this study was to determine relationships between triple jump phases and velocity variables in Turkish athletes.
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.
In the stutter jumps, we can move the mass at a lower frequency to get off the ground.
If we're successful on the first couple of jumps on the Saturday the idea is that I'll lengthen the jump a bit farther.
In a week that saw Huntingdon modify their water jump, ofcials at both Stratford and Ludlow insisted the water jumps at their tracks would remain - insisting the hazard was far safer than regulation fences or open ditches.
Middlesbrough results: U-13 boys: high jump, P O'Connor (1st) 1.
Hop jump: Hop on one leg for several jumps, alternate legs.
Because there are often more jumps and turns, says Marika Molnar, founder of Westside Dance Physical Therapy in New York, the gluteal muscles get more of a workout and the spinal column gets more compression from the high landings.
For the box jump, the non-stretchers showed a 7% increase in power.
To track down these hackers, federal agents must obtain and review various logs from each of the jumps or victims.