Definition of trifocal in English:

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trifocal

Pronunciation: /ˈtrīˌfōk(ə)l/

adjective

(Of a pair of glasses) having lenses with three parts with different focal lengths.
Example sentences
  • One analysis reports that neck pain experienced by middle-aged patients often coincides with their first prescription for bifocal or trifocal glasses.
  • A bifocal lens corrects both far and near vision, while a trifocal also has an intermediate zone.
  • Additionally, where bifocal or trifocal lenses are not desirable, disposable lens shields and ‘press-on’ lenses in the upper and/or upper-central regions of the lens have been proposed.

noun

(trifocals)
A pair of glasses with trifocal lenses.
Example sentences
  • Scopes also help mature shooters continue in the sport longer, he said, because finding iron sights through bifocals and trifocals can be challenging.
  • And if you wear bifocals or trifocals, keep in mind that you may have a tendency to tilt your head backwards so that you can see through the lower portion of your glasses.
  • I paid $100 American for blended trifocals, and they are the best glasses I have ever owned.
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