bifocal spectacles

bi·fo·cal spec·ta·cles

spectacles with bifocal lenses. See: lens.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Without his "Franklin" bifocal spectacles, the world appears to Brodie as nothing more than a vague mist, "utterly aqueous"; it's an early sign that this young Scotsman's vision is not necessarily to be trusted.
If these do not sufficiently improve, progressive or bifocal spectacles can be additionally prescribed to manage the associated progression risk.
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 also invented the lightning conductor and bifocal spectacles and wrote and published Poor Richard's Almanack, whose famous maxims included 'God helps them that help themselves' [sic].
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.
Franklin invented the Franklin stove, bifocal spectacles, and the lightning rod and contributed to science with his experiments in electricity.
Senior product manager Patricia Townsend says, "For many people, bifocal contact lenses will offer a comfortable alternative to bifocal spectacles and may help reduce the trauma of adjusting to wearing corrective lenses." The Hydron Echelon can be used with all soft lens cleaning regiments, the company says.
In 1723 he ran away to Philadelphia, where he set up his own newspaper, published Poor Richard's Almanack, and with intense energy established a subscription library, a philosophical society, a fire company, a hospital, a militia, became postmaster of Philadelphia, proposed the University of Pennsylvania, devised bifocal spectacles, a stove, and a water - harmonica.