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 EG obtained a significant reduction from 19.2 to 17.5 s (p = 0.001, ES = 0.67) in the performance time after 8 weeks of jumping rope training, while CG showed a negligible reduction from 20.1 to 19.9 s (p = 0.226, ES = 0.07).
As you become more comfortable jumping rope, try the frontal crossover jump, passing the rope over your head and then crossing your arms.
Thirty-nine percent of the participants who jumped with the blue-and-yellow mat stated that it always helped them maintain their position while jumping rope; 25% stated that it helped, and 17% said that it helped somewhat.
He was killed instantly when he slammed into the ground after being attached to a bungee jumping rope which was too long.
They had chosen the chocolate cookie (55 calories) as their snack and discovered that less than 10 minutes of jumping rope would be required to burn the 55 calories because jumping rope used 60 calories in 10 minutes.
Ashely Jumping Rope! Ashely Edmond, 6 Deposit, New York
Jump Rope Magic (The Blue Sky Press, $16.95), a children's picture book filled with the color, rhyme and whimsy found in the simple joy of jumping rope, by Afi Scruggs, and illustrated by David Diaz.
Preliminary results show that hopping on a pogo stick causes the rapid leg-muscle contraction needed to build tone but is much easier on the knees than jumping rope or jogging.
At the elementary school level, at any rate, jumping rope became an almost exclusively female sport.
Marcus, a second-grader from Wadsworth, joined 450 of his fellow kindergarten through second-grade schoolmates in jumping rope for 25 minutes during gym class Tuesday.
"A liquid diet, running, jumping rope," the actor, 44, tells Men's Health.