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
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in classic literature ?
His father ran out with a stick, but by the time he came up, Karait had lunged out once too far, and Rikki-tikki had sprung, jumped on the snake's back, dropped his head far between his forelegs, bitten as high up the back as he could get hold, and rolled away.
Then he jumped. The head was lying a little clear of the water jar, under the curve of it; and, as his teeth met, Rikki braced his back against the bulge of the red earthenware to hold down the head.
AND tried to put his foot upon Peter, who jumped out of a window, upsetting three plants.
The robbers sat round the fire, sang and drank; and the old female robber jumped about so, that it was quite dreadful for Gerda to see her.
However, towards morning she takes a draught out of the large flask, and then she sleeps a little: then I will do something for you." She now jumped out of bed, flew to her mother; with her arms round her neck, and pulling her by the beard, said, "Good morrow, my own sweet nanny-goat of a mother." And her mother took hold of her nose, and pinched it till it was red and blue; but this was all done out of pure love.
Just behind her was Jessica Hanson who started with an excellent 1.29m high jump then ran 11.32s at 60m hurdles, threw 5.68m at shot, jumped 3.78m at long jump and ran 3:00.34 at 800m to score 1756 points for 17th.
ua A total of 4665 motorists jumped red signal ua Heavy vehicle jumping Red signal 51 ua Light vehicle jumping red signal 4613 ua Motorcycle jumping red signal 1
The Finn Valley athlete jumped 1.90m to take silver behind Karina Taranda of Belarus who took gold after clearing 1.92m.
"I actually jumped better last year," said Strickland.
I WAS very sorry to read about the death of a girl bungee jumping due to her not comprehending the Spanish instructor when he said "No jump" ie do not jump - and actually jumped.
The approach velocity mean values are over 10 m/s for elite triple jumpers who has jumped over 17 meters(Donley, 1991; Hommel, 2009; Miller and Hay, 1986; Woo and Kim, 2011), more than 1m/s faster from Turkish triple jumpers (V10=9.14[+ or -]0.4 m/s).
After landing, the participants immediately jumped as high as possible straight up in the air, and landed back on the marked cross.