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
References in periodicals archive ?
And a change like this can never be considered a case of jumping the shark.
Jumping the shark is, of course, another way of saying a once-decent show needs to be put out of its misery.
Still, as with the television shows they are promoting, social-media marketers must know when to pull back if they feel they're reaching a "jumping the shark" moment.
"Once you've eaten a dog Jez accidentally kills one in series four and tries to hide his mistake from the owner by pretending it's turkey and nobody accuses you of jumping the shark, it's not like you can't have massive things happen." Webb, who also plays a lecturer in Armstrong and Bain's sitcom Fresh Meat, is full of admiration for the writers, who he says are ruthless about discarding anything that isn't right for the story.
The Americans refer to it as 'jumping the shark' after the episode in Happy Days in which Fonzie leaps over a Great White while water-skiing.