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 ?
But instead of jumping to the conclusion that more time available for drinking means more drunkenness, we should look at what happens in other countries.
But beware of jumping to the conclusion that "this revisionist intellectual class in the Church" (to use Wrenn and Whitehead's term for them) lacks sincerity.
That doesn't necessarily mean jumping to the conclusion that "Big Government" should simply throw in the towel.