- 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.
- optics having two different focuses
- relating to a compound lens permitting near and distant vision
- Having two focal lengths.
- Having one section that corrects for distant vision and another that corrects for near vision.