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 ?
UK households collectively owe nearly PS160bn in unsecured consumer credit, with low-income households "vulnerable to exploitation by unscrupulous firms", it added In its report, Jumping The Shark, the think tank has called for an Affordable Credit Trust (ACT) to mobilise not-for-profit institutions to compete with firms such as Wonga, Quick Quid and Payday Express.
Jumping the shark is, of course, another way of saying a once-decent show needs to be put out of its misery.
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.