Chiefly Optics. having two foci.
(of an eyeglass or contact lens) having two portions, one for near and one for far vision.
bifocals, bifocal eyeglasses or contact lenses.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 1 “Franciscans” to “French Language” Various
Parallel Paths Thomas William Rolleston

(optics) having two different focuses
relating to a compound lens permitting near and distant vision

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