Definition of "bifocal" [bi•fo•cal]

• Having two focal lengths. (adjective)
• Having one section that corrects for distant vision and another that corrects for near vision, as an eyeglass lens. (adjective)
• Embodying two distinct and often conflicting goals, interests, or courses of action: "a smoothly functioning bifocal mind” ( John McPhee). "A bifocal monetary policy . . . has kept one eye on the money supply and the other on interest rates” ( Edward Meadows). (adjective)
• Eyeglasses with bifocal lenses. (noun-plural)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He produced other inventions as well, such as bifocal eyeglasses and the efficient Franklin stove."
• "No intermediate lenses but u get optimal distance correction as well as reading. .and u will also look younger with them glasses as they don't have the telltale "bifocal" line."
• "If not, then you got something "off the rack", and it may just be that the "bifocal" part covers more of the lens than necessary."