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 ?
Right from the off, Auntie's bloomers blew all over the windy links as they jumped the shark and didn't seem to give a duck.
It's also the surest sign the quenelle has officially jumped the shark.
In March, aiCIO asked whether risk parity jumped the shark.
Austin progressives petition White House to secede from Texas (The Daily Caller): "The dueling White House petitions may have just jumped the shark.
Indeed, the flap over the poor-quality maps on the iPhone 5 has led some people to wonder if Apple has already jumped the shark.