bifocal

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Related to bifocal glasses: trifocal glasses

bifocal

1. Optics having two different focuses
2. relating to a compound lens permitting near and distant vision
References in periodicals archive ?
He also found time to invent the lightening rod and bifocal glasses.
People who wear bifocal glasses know all about how the distorted view they get when looking downwards at the ground.
The lens is not useful for those who use bifocal glasses.
Rather than use a magnifying loop that can play tricks with perspective, she wears drugstore reading glasses on top of her prescription bifocal glasses.
Janet Vranish from Taylor, WI asked a question regarding using bifocal glasses and having problems focusing through her peep.
Using regular bifocal glasses when computing can cause problems, as can glasses with progressive lenses because the intermediate zone is too narrow.
Do you know what bifocal glasses, security mirrors, and the Franklin Stove all have in common?