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 ?
She wrote: "Concerns have been raised as to whether this will create a two-tier system of health provision and reversion to longer waiting times with NHS patients jumping the queue.
And if they see anyone jumping the queue they will not be able to proceed to their destinations.
From an under-aged girl still living with mum Who has a young child and the future looks glum They'll give her a flat that's all they can do But the jealous accuse her of jumping the queue.
A NOTORIOUS family have provoked outrage after jumping the queue for a home in a soughtafter area.