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The action of a varifocal lens system in a camera or microscope that maintains an object in focus while approaching it or receding from it; this effect may be obtained by moving two or more of the lens components at rates bearing a linear relation to one another.
Farlex Partner Medical Dictionary © Farlex 2012
To magnify (“zoom in”) or shrink (“zoom out”) an image in order to highlight some of its smaller features or some of the environment in which the imaged object is situated.
Medical Dictionary, © 2009 Farlex and Partners