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 ?
YOUNGSTERS in Hillfields jumped for joy as they celebrated the first day of term at their newly-amalgamated school.
The Dutchmen jumped for joy as they celebrated a success that guaranteed them their own place in the record books, becoming the first pair in the Open era to win all four Grand Slam titles in their career.
Clive and Shahin Muir from Chiswick, West London, jumped for joy when they checked the Lottery results and thought they had five correct figures plus the bonus ball.
When Trevor Kimber, 47, David Brock, 46, Tony Fitt, 56, and Dave Edwards, 63, realised their luck was in, they jumped for joy. But the men, who earn pounds 300 a week, will still work their notice to help their boss.
THE Coventry family of silver medal winning athlete Marlon Devonish (above) jumped for joy watching his race on TV.