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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 ?
Most of the players were local lads and not one of them jumped ship.
But, if you examine the situations, there aren't that many differences between the way Ferguson left Goodison in 1998 and the manner in which Rooney jumped ship last summer.
Cribben and his four selectors met the Football Board for a questions and answers session, and at the end Cribben resigned as he felt he no longer had the confidence of his employers - he jumped ship before he was pushed.
What they're saying is with the people they've hired, minor leaguers and the guys that jumped ship, they've got 13 guys, so they need 23 to fill out the staff,'' Froemming said.
He said five of the crew mysteriously vanished in three Irish cars that called to the vessel, while three others are believed to have jumped ship and applied for political asylum.
That love ended his culinary seaman's career when, in 1959, he jumped ship in Brooklyn, New York.
She has jumped ship from Women Model Management run by Paul Rowland, with whom the beauty once shared a bath for a photo shoot.
Some professors have already jumped ship because of the chaos.
Partners in the Busang project promptly jumped ship.
When Jayhawks co-founder Mark Olson jumped ship, it turned out to be the best thing that ever happened to this recently reunited Minneapolis outfit.