You searched for: “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.
This entry is located in the following units: focus-, foci- (page 2) tri-, tre- (page 5)
Word Entries containing the term: “trifocal
trifocal lens (s) (noun), trifocal lenses (pl)
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)