bifocal spectacles

bi·fo·cal spec·ta·cles

spectacles with bifocal lenses. See: lens.
References in periodicals archive ?
On a lighter non-political note you become aware that you are hitting a certain age when you have a discussion with your friends on the benefits of bifocal spectacles.
I am not past my sell-by date, but I suppose I have become slightly middle-aged" Sadie Frost, 47, who now admits she cannot read without bifocal spectacles "She is a limited, pedantic bore, with no lateral grasp, very little humour.
He developed numerous inventions, including the Franklin stove and bifocal spectacles, and made many important experiments in electricity.
Bifocal spectacles are made so that the wearer looks through one part of the glass into the distance and another part of the glass for close-up work.
Traditional bifocal spectacles usually have a small area in the bottom of the lens, known as the addition portion, that provides up-close focusing.
David Ruston, an optometrist in central London, said: ''My patients in their mid-40s still feel very young and don't want to resort to bifocal spectacles or reading glasses as they see them as a visible sign of ageing.
Traditional bifocal spectacles have a divided lens with the bottom area adapted for close-up viewing.
These three lenses provide the most effective alternatives to bifocal spectacles.