jump

(redirected from jumping through hoops)
Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia.

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 ?
"This is a huge amount of money for us to be entrusted with and we are delighted that the trustees of Jumping Through Hoops recognise our ability to reach out to the voluntary and community sector and develop grant programmes which will have a real impact on the lives of young people in Coventry."
STUDENT footballers from Tyneside were jumping through Hoops at the thought of playing the Scottish youth champions.
"It's about emancipating the artists and teaching them that they can have thriving careers without jumping through hoops and having to cater to major label agendas," says Alexander, who plans to have 30,000 subscribers (or artists) on board by mid-2006.