bifocals








adjective

  1. Chiefly Optics. having two foci.
  2. (of an eyeglass or contact lens) having two portions, one for near and one for far vision.

noun

  1. bifocals, bifocal eyeglasses or contact lenses.

pl n

  1. a pair of spectacles with bifocal lenses

adjective

  1. optics having two different focuses
  2. relating to a compound lens permitting near and distant vision
n.

“bifocal spectacles,” 1899, see bifocal. Conceived by Benjamin Franklin, but called by him double spectacles.

adj.

“having two foci,” 1844, from bi- + focal.

adj.

  1. Having two focal lengths.
  2. Having one section that corrects for distant vision and another that corrects for near vision.
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