bifocal
oxford
views updated May 21 2018bi·fo·cal / ˈbīˌfōkəl/ •
adj. (usually of a pair of eyeglasses) having lenses each with two parts with different focal lengths, one for distant vision and one for near vision.•
n. (bifocals) a pair of eyeglasses having two such parts.
The Oxford Pocket Dictionary of Current English