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 ?
The unmanned Montreal, Maine & Atlantic Railway train broke loose early on Saturday and sped downhill nearly seven miles before jumping the tracks at 63 mph.
ODELL LAKE - A Union Pacific freight train derailed early Monday morning with 14 mostly empty cars jumping the tracks a stone's throw away from the popular Shelter Cove Resort on Odell Lake.
Think of having a train traveling down a two-track tunnel and jumping the tracks and continuing along its way at the same speed," explains Loh.