jump

(redirected from jump the track)
Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia.
Related to jump the track: liven up, taking for granted

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 Rylander seemed to jump the tracks with his suggestion - delivered with a smile, but delivered without rebuttal - that the people in front of him could use their bureaucratic wiles to follow the state's open information laws, which require responses to requests within 10 business days, as slowly as possible.
But as serotonin spreads from the brain into the spinal cord, we found the chemical can 'jump the tracks', moving from pain-sensing neurons to nerve cells that influence itch intensity."
Larger objects, such as bricks or cinder blocks, have caused trains to jump the tracks, but a penny just isn't big enough to cause damage to the train.