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Definition of Trifocals
1. Noun. (optics) Spectacles with corrective lenses that have three different powers per eye. ¹
¹ Source: wiktionary.com
Definition of Trifocals
1. trifocal [n] - See also: trifocal
Lexicographical Neighbors of Trifocals
Literary usage of Trifocals
Below you will find example usage of this term as found in modern and/or classical literature:
1. The Women's Health and Aging Study: Health and Social Characteristics of ...edited by Jack M. Guralnik, Linda P. Fried, Eleanor M. Simonsick, Judith D. Kasper, Mary E. Lafferty edited by Jack M. Guralnik, Linda P. Fried, Eleanor M. Simonsick, Judith D. Kasper, Mary E. Lafferty (1996)
"Make sure the participant is wearing glasses if she uses them to view things at
a distance. lf the participant wears bifocals or trifocals, instruct her to ..."
2. Refraction of the Human Eye and Methods of Estimating the Refraction by James Thorington (1916)
"trifocals.—Occasionally, a patient is not content with bifocals, but will demand
a focal point somewhere between FIG. 321. FIG. ..."
3. The Well-Being of Video Display Terminal Users: An Exploratory Study by Mark S Gottlieb, Steven L Sauter, Vernon M Dodson, Kathryn M Rohrer (1999)
"... or contact lenses to report eye strain more than non-users with bifocals/trifocals.
In the two-way ANOVAs examining the influence of the present ..."
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