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 ?
Neither does anyone leap to the conclusion that they were going too fast or that all would be well if the speed limit were reduced.
It was a small leap to the conclusion that new cities could bring the same dynamism to progress for a nation that new firms bring to progress for an industry.
I don't leap to the conclusion that all benefit claimants are fraudsters but what I read in Chronicle every day suggests there is an evil world out there - with murders, frauds, drunkenness, fights, thefts, drugs, etc.
Instead, transport officials illogically leap to the conclusion that installing parking meters is the solution.