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 ?
Not everyone jumped into bed with a partner; these are their stories of dealing with a hectic time of social revolution.
Self-confessed man-hater Nicky jumped into bed with the 22-year-old yesterday after he said he'd had a bad dream.
What can you expect from a married woman, however unhappily situated, who admits that she was smitten by a few sweet words said by her unexpected new visitor, so at the sight of him removing his clothes, she also undressed and they jumped into bed and knew each other?
Her brief naked display was greeted more enthusiastically - and she showed no signs of modesty tonight as she peeled off and jumped into bed with co-star Josh Cohen.
Spell out how you feel and how much you miss what you had then suggest you meet and see if you can't try to rewind the clock to the night before you jumped into bed together.