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
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
If other clients get wind of the fact that your business has lost a high-profile customer, they may consider jumping ship, too.
Alabama Christian Coalition leader John Giles announced that his chapter is jumping ship. Giles said his group would rename itself and end all connection with the CC's national office in South Carolina.
Fernando Alonso's defection to McLaren for 2007 prompted suggestions he was jumping ship prior to a Renault withdrawal from grand prix racing.
Canavan was in action for Tyrone at Croke Park yesterday and it's been suggested he was waiting for their season to end before jumping ship.
With all of the senior-level brokers jumping ship right now, Fiedler sees it as inevitable that real estate firms will be scrutinizing the contracts of incoming brokers--and maybe even adding more in the way of "restrictive clauses".