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 ?
He acted as if he would when decisions were to be made over the next four years: He would not just leap to conclusions, but consider his options.
A common pitfall to watch out for is that companies are tempted to leap to conclusions or stop too soon before truly understanding all the contributing factors.
WHEN a player is 24 and you're told he has all the talent in the world, yet it looks like he has been standing still or going backwards since 16, you leap to conclusions.
It's human nature to leap to conclusions, especially in busy and stressful environments like healthcare.
But Klein has found that today's battle captains are quick to assume great risk in the absence of adequate situational awareness and leap to conclusions about what to do based on tacit knowledge derived from their professional military education, realistic training in virtual combat environments, and an innate confidence in themselves and their soldiers' moral and physical makeup.
Hastert's head are the same voices who tell us that the larger society must be tolerant of private lifestyle choices, and certainly must never leap to conclusions about gay men and young boys.