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Photonics Dictionary

image jump

The apparent displacement of an object caused by a prismatic error - due to lack of parallelism of the two faces that make up an optical element such as a bifocal - in an optical system, that is seen when the system is rotated. Image jumps are also a common occurrence produced by the sudden introduction of the prismatic power found at the top of a bifocal segment. The object the viewer sees suddenly jumps upward when the eyes turn down to look at it.
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