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 ?
From there it is but a short leap to the conclusion that there's no actual desire to compete on price--otherwise you'd be eking out every last soupcon of cost to reinvest.
For instance, it was a facile leap to the conclusion that such thinly veneered pornography was merely bait that the school used to lure its fledgling miscreants out into the open--whereupon I, after being widely exposed and thoroughly ridiculed, would be left twisting slowly in the wind from the tallest tree in the town square.
Therefore, to leap to the conclusion that arsenokoites refers to men having sex with other males is "linguistically invalid," Martin says.
Some may leap to the conclusion that the presence at Ascot of Hurricane Run might preclude a challenge from either the Irish Derby hero or King Edward VII Stakes winner Papal Bull, as all three are owned by concerns bound to Coolmore Stud.
Added Scalia, "How could your reporter leap to the conclusion (contrary to my explanation) that the gesture was obscene?