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 periodicals archive ?
HOW can we be sure that George Bush is actually here?He could be just a look- alike or even an image produced in computer graphics?If we can use technology to superimpose Sven Goran Eriksson into the crowd of every televised football match and Prince Harry jumping for joy whenever England score at rug by -the mind-boggles at what Bill Gates and the CIA could get up to.
Kylie had her adoring fans jumping for joy when she performed her No 1 smash, Spinning Around.
EDDIE the Eagle Edwards was jumping for joy last night after gaining GCSEs in law, maths and physiology.
EFE AMBROSE was jumping for joy after netting in Celtic's thrashing of Motherwell last night - on the day his wife delivered a new baby daughter.
CHAMPION jockey Tony McCoy was jumping for joy when he received his OBE from the Queen at Buckingham Palace.
IT'S not just staff and pupils at Rowley Lane School who are jumping for joy.
Martin Lewis, the website's founder said: "We're jumping for joy and hope the other big banks follow suit."
A GROUP of children are jumping for joy after achieving success at an athletics contest.
These girls, left, and Lorna Heslop and Kirstie McDougal, below left, are all set to go; JUMP FOR JOY: Rachel Leeming and Jessica Lightfoot are jumping for joy, left, while triplets Amy, James and Laura Williamson, below, are all dressed up for their night out; PARTY MOOD: Katie Mann and Darren Iveson, left, are in the mood to party, along with Lauren Crolla and Jade Pickering, right, and this group above; LINED UP: Pupils from the school were more than willing to line up for the camera before start of the Prom, left and right; Pictures by ANDREW GRAY
A COLLEGE basketball team is jumping for joy after netting another victory.
Youngsters from Pontypridd are jumping for joy after securing a kit sponsorship deal with Western Power Distribution.
Punters who gambled on Ireland being based in Poland will be jumping for joy should we be drawn there tonight.