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 ?
Based on this evidence, "I immediately jumped to the conclusion that this was a dwarf spheroidal galaxy," Irwin says.
When Kim found out that he couldn't possibly be Bree's father, he jumped to the conclusion that Janelle had been cheating on him - and who could blame Erinsborough's oldest surfer dude for thinking such a thing?
Many researchers jumped to the conclusion that spermicides also offered a shield against HIV because nonoxynol 9, the active ingredient in most spermicides, kills HIV in the test tube.