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“trifocal”
trifocal (noun), trifocals (pl)
1. Having three focal lengths.
2. Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision; such as, an eyeglass lens.
2. Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision; such as, an eyeglass lens.
Word Entries containing the term:
“trifocal”
A lens with three parts of different refracting powers: the upper for distant sights, the middle for intermediate views, and the lower for near visions.
This entry is located in the following units:
focus-, foci-
(page 2)
lenti-, lent-, lens- +
(page 2)