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 ?
Jumping into bed with Mr Cameron has seen Mr Clegg go from hero to zero in record time, his party so low in the polls it's in danger of disappearing.
There are plenty of women out there who appreciate a man who wants to get to know them before jumping into bed.
Expert Dr Pam Spurr said: "This research dispels the myth that singles are jumping into bed on the first date.
Next time a woman lies prostrate at your feet, talk to her and get to know her before jumping into bed.
And she goes right in at the deep end - jumping into bed with her screen mum Deidre's ex-lover.
Expert Dr Pam Spurr said: "This research dispels the myth that British singles are jumping into bed on the first date.
The only thing Daisy Wright will be bitter about is when the cash for interviews runs out and some other nobody makes a name for herself by jumping into bed with another star dumb enough to think these women will kiss but not tell.
Get to know one another better before jumping into bed and if you are still together in three months, at least you know it's for the right reasons.
Viewers will see Tony help sultry factory boss Carla Connor (Alison King) to get over the death of her husband Paul by jumping into bed with her.
The pictures of Britney letting it all hang out, emerged just hours after she appeared on American TV jumping into bed with an admirer in comedy How I Met Your Mother.