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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 ?
'I have sent the video of my jumping jacks performance to the Guinness Book of World Records for their approval and entry into the next edition of the same,' a jubilant Ali said.
ua A total of 4665 motorists jumped red signal ua Heavy vehicle jumping Red signal 51 ua Light vehicle jumping red signal 4613 ua Motorcycle jumping red signal 1
These jumping genes then use nurse cells to produce invasive material (copies of themselves called virus-like particles) that move into a nearby egg and then mobilize into the egg's DNA.
In a study described as 'the most advanced of its kind to date', scientists looked at why the anatomy of the jumping spider evolved the way it did.
The jump height was defined as the difference between the highest point during jumping and the mean height of a two-second window during standing, because these time points can be accurately defined from the coordinates of the sensor with a sampling rate of 50 Hz.
'I'm very impressed that there is a jumping spider species capable of killing and eating small frogs and lizards,' said Martin Nyffeler, co-author of the study and conservation biologist from the Switzerland University of Basel, in an email to National Geographic.
The triple jump is one of the jumping events in track and fields, and requires high levels of physical preparation and technical ability.
Shoulder flexion at take-off likely increases muscle capabilities that can be used during jumping (15).
"Dream Jump Dubai will break all boundaries of rope jumping as we know it and it will enable athletes to experience base jumps ...
side swing | : This is where the rope passes the side of the skipper's body, without he or she jumping it, and the skipper usually performs a basic jump after aside swing, or a cirss-cross.
"It has been a little bit of a surprise, but I knew I had the jumping ability, it was just pretty technical."
The Lions' track and field program will gladly welcome Eke as a freshman this fall after she dominated jumping events like no other in Central Mass.