1. having two different focal lengths or optical powers in the same lens
Usage: optics

1. eyeglasses with lenses that have two different optical powers, typically for seeing both near and distant objects clearly
Usage: usually plural: bifocals

Examples

• She needed bifocal lenses to read and drive safely.
• The optometrist recommended bifocals for his presbyopia.
• He kept losing his bifocals and couldn’t read the menu.
• Bifocal glasses have a visible line separating the two lens powers.
• Many people switch to progressive lenses instead of traditional bifocals.
• The bifocal design allows clear vision at multiple distances.