Bifocal – (In glasses) A lens that has two parts, one for near vision and one for distanace
Bike-riding folk singers all (bifocal) wear glasses with two part lenses. They play their guitars looking through one part while scanning the distance through the other.
Examples of bifocal in a sentence
He needs some bifocal sunglasses.
You can buy bifocal glasses for a low price.
Lenses are available in single vision and bifocal versions.