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Related to trifocal glasses: Bifocals, bifocal glasses, Progressive lenses
lenses arranged in a frame holding them in the proper position in front of the eyes, as an aid to vision. Called also eyeglasses and spectacles.
trifocal glasses glasses with trifocal lenses.
Glasses with three different corrections in each lens: one each for near, intermediate, and far vision.
See also: glasses