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 ?
When you start jumping rope, be sure to wear tennis shoes and stretch before and after you jump.
If you keep it up, you will continue jumping rope and exercising as an adult.
Find out more about jumping rope and how you can get involved at the Amateur Jump Rope Federation.
Jumping rope, however, isn't for exercise neophytes.
New fitness classes run the gamut from jumping rope to lifting weights
Pinecrest also will receive a free physical education curriculum kit based on jumping rope as a fitness exercise and a basketball skills kit featuring Duke University coach Mike Krzyzewski.
Twenty years ago, jumping rope was for kids and boxers,'' said Bobby Hinds, the president of Lifeline International Inc.
In jumping rope, the stress to the knee is less than running.
We were able to measure the energy expenditure of jumping rope by putting a mouthpiece in and collecting air,'' Getchell said.
He tried jumping rope, plyometrics - anything to refuel the fast-twitch muscle fibers.