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 ?
As she battles to prove her innocence, the media quickly leap to the conclusion that she is guilty, making her the target of violent and vitriolic attacks.
takes the word 'chairman' to have any necessary reference to a chair, even if it originally did." Therefore, to leap to the conclusion that arsenokoites refers to men having sex with other males is "linguistically invalid," Martin says.
Some may leap to the conclusion that the presence at Ascot of Hurricane Run might preclude a challenge from either the Irish Derby hero or King Edward VII Stakes winner Papal Bull, as all three are owned by concerns bound to Coolmore Stud.