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“trifocals”
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.