bifocal lens


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Related to bifocal lens: Progressive lens

bifocal lens

[bī′fō·kəl ′lenz]
(optics)
A lens with two parts having different focal lengths.
In particular, an eyeglass lens having one part that corrects for distant vision and one part for near vision.
References in periodicals archive ?
This document contains the following papers on theory from the SITE (Society for Information Technology & Teacher Education) 2002 conference: (1) "The Emerging Ecological Contribution of Online Resources and Tools to K-12 Classrooms" (Therese Laferriere, Robert Bracewell, Alain Breuleux); (2) "Pedagogical Ethnotechnography: A Bifocal Lens To Understand Technology in Education" (Prince Hycy Bull); (3) "The Design of Electronic Learning Environments in Teacher Education: Understanding the Importance of Representation as a Choice in Technology Production" (Sebnem Cilesiz and Richard E.
Last April, Vistakon in Jacksonville, Fla., introduced a bifocal lens with five concentric rings of different optical powers.
A bifocal lens system correction eliminates the limitation of monochromatic virtual images.