Liberal Dictionary English Dictionary
trifocal 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. Liberaldictionary.com
The American Heritage® Stedman’s Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.