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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
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.
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.
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.
During the summer, LAUSD recruited more than 1,000 new teachers and retained many veteran educators who would have otherwise jumped ship for better-paying school districts.
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.