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 ?
Still on the hunt for her next drink, she heso bnwh heads into town where she's soon propping up a bar before later stripping off naked and jumping into bed with a random stranger at his hotel (left).
Be a bit more choosy which means not jumping into bed with every guy you meet and hoping it will develop into a love affair.
According to News.com.au, in the closing scenes of the new ad, which sees a ball thrown around a suburban house, McCullough, the only black player in the commercial, is seen jumping into bed between a couple and making advances towards the woman.
Avoid jumping into bed immediately - sex will be all the better for waiting.
You knew you weren't jumping into bed with the last of the Vestal Virgins and Dee's experience was part of the turn on, wasn't it?
I agree with him that independence isn't on the radar in Wales at the moment due to Plaid and Labour jumping into bed together.
He was the most right-wing Prime Minister Britain has had for over 60 years, who had no hesitation in jumping into bed with the Tories when he wanted to gain a majority on some right-wing issues which were very unpopular with most of his own Labour MPs.
The survey, by condom manufacturer Durex, shows Britain comes 10th in the world sex league - with most people jumping into bed an average 107 times a year.
The survey of 18,000 people in 27 countries by leading condom brand Durex showed most young British lovers are jumping into bed for the first time aged 17.1 - a year younger than the global average.