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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 ?
Police said one theory was that the teenager stowed away on a vessel bound for the UK and jumped ship as it neared land.
In other Sect news, Anthony Pappalardo has jumped ship citing "a need for a change," which usually means you think you might be able to get on Girl.
Love Actually actress Joanna Page has jumped ship from starring in a monster blockbuster to sailing on a monster wavebreaker.
The sales team jumped ship to Cushman & Wakefield only days after CBRE pulled a similar stunt by hiring two Cushman brokers, Darcy Stacom and Bill Shanahan.
Five people, includingBrianShaddock, the Arkansas iNET executive director, recently jumped ship. Shaddock is heading up CSI, which he says will probably do business under another name.
Two years later he jumped ship in San Francisco and set off on foot to his father's home in Guatemala--shades of Brancusi's legendary hike from Romania to Paris.
Before Jim Jeffords jumped ship, our sister progressive magazine, The Nation, had a great cover caricature of the orange-hued, Chia-haired Strom Thurmond.
She was United's vice president of customer satisfaction worldwide when she jumped ship a year ago to become vice president of total guest satisfaction at Royal Caribbean International, operator of 13 ships including the world's two largest cruise vessels, Voyager of the Seas and Explorer of the Seas.
Gary Moore of EDS jumped ship to join a Silicon Valley start-up, and IBM executive Bob Howe departed Big Blue to join Scient, an Internet consulting firm.
An article in Washington Business Journal (June 18-24), headed "Phillips battles Web defections," stated, "At least eight editorial staff members have resigned from a unit of Potomac-based Phillips Publishing International in the last few months, and a top-level marketer has jumped ship to lead an upstart virtual newsstand in College Park."
British Telecommunications Plc and United News & Media Plc have announced a 12m pound ($19m) injection of cash into their LineOne UK free ISP joint venture, two weeks after third shareholder News International jumped ship. The cash will be used to provide re-branded ISPs for the owner's subsidiaries, such as the Daily Express newspaper and a number of local television stations.