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 ?
When a Bollywood star appeared in a mall here recently, everybody jumped the queue to catch a glimpse of him, glass doors were shattered and the very nervous movie star had to be bundled out of harm's way.
Some of the truck drivers trailing behind them alleged that Haroon and Singh had jumped the queue to reach the UAE Customs office so quickly.
"What was happening was that while a majority of patients waited for months to get surgeries done at the hospital, those referred by consultants from their private practices always jumped the queue and got preferential treatment," said Dr Al Sa'ati.
STUNNED film-goers were shocked when a horse jumped the queue and burst into a local cinema.
But after the pilot's cockpit light indicated the aircraft did not have sufficient fuel to land with enough of a safety margin, the plane jumped the queue at Heathrow.