bifocal

People with progressive lenses or bifocals may need to go to an optician in person.

Any other fish or mammal would have been just as likely as Anableps to begin the development of a bifocal eye.

His most direct contribution to medicine was the invention for his own use of bifocal eyeglasses.

The very bifocal glasses, now in such general use, that he wore were a triumph of his own quick wit.