What does bifocals mean?

bifocals meaning in General Dictionary

glasses whoever lenses have actually two foci permitting the user to see both far and close by objects obviously The lenses are partitioned horizontally top of the and reduced components having different focal lengths

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  • (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision

bifocals meaning in Etymology Dictionary

"bifocal spectacles," 1899, see bifocal. Conceived by Benjamin Franklin, but known as by him two fold spectacles.