jump

(redirected from jumping through hoops)
Also found in: Dictionary, Thesaurus, Legal, 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
References in periodicals archive ?
Sherod Williams, chair of Jumping Through Hoops, said: "I would like to thank all trustees past and present who have given their time and their expertise in reaching this point.
This included disarming attackers,and jumping through hoops set alight during the display.