trifocal lens

Medical Dictionary

trifocal lens tri·fo·cal lens (trī-fō'kəl, trī'fō'-)
n.
A lens having one section that corrects for distant vision, a second section that corrects for intermediate vision, and a third that corrects for near vision.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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