Definition of bifocal in English:

bifocal

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adjective

  • (usually of a pair of eyeglasses) having lenses each with two parts with different focal lengths, one for distant vision and one for near vision.

    ‘The multiple vision lenses include bifocal lenses for near and distant vision.’
    • ‘Three different designs for bifocal contact lenses exist: simultaneous, concentric and alternating vision.’
    • ‘Alternatively, some people use varifocal or bifocal lenses in order to see objects clearly that are both close up and far away.’
    • ‘Two developments, bifocal lenses and better spectacle frames, helped move optometry from a vendor trade toward a recognized profession by making fitting and selecting eyeglasses more complicated.’
    • ‘Bifocal contact lenses, like bifocal glasses, provide distance and close-up correction on each contact.’
    • ‘Most people can't see a crisp 20/20 at near or far distances with our current generation of bifocal contact lenses.’
    • ‘There is no one ‘best’ soft bifocal contact lens.’
    • ‘A friend told us this company was going to revolutionise bifocal contact lenses.’
    • ‘Without bifocal vision, he lacked depth perception and couldn't tell how far ahead of him horses were.’
    • ‘Bifocal contact lenses to correct distance and reading vision, so that the obvious bifocal glasses with their ageing implications could be avoided, have not proved successful.’
    • ‘Accommodative effort and retinal blur can be minimised by bifocal glasses, which change the focal point for near work.’
    • ‘But they also have a bifocal segment in the lower quadrant of the lens that lets us find the correction needed to bring the front sight into focus.’
    • ‘Bifocal lenses with separate fields for near and far vision, working in much the same way as bifocal spectacles, have been available since the early 1990s, but these still provide optimal vision only at two fixed distances.’
    • ‘People with bifocal glasses are especially prone to neck aches because they may have to tilt their heads back to see things up close.’
    • ‘Soft lenses for daily wear have a very short adaptation period and are available in various tints and bifocal designs.’
    • ‘Back home, he made one more great contribution to human felicity: bifocal glasses.’
    • ‘The teacher was a cheery middle-aged woman with black hair and rather thick bifocal glasses.’
    • ‘He wears bifocal glasses with gold rims and a black-faced watch.’
    • ‘Therefore, a bifocal relay mirror effectively puts the laser source at the mirror.’
    • ‘This restricted the movement of her head which reduced her ability to use her bifocal glasses.’

Pronunciation

bifocal

/ˈbīˌfōk(ə)l/ /ˈbaɪˌfoʊk(ə)l/

noun

bifocals
  • A pair of eyeglasses having lenses with two parts with different focal lengths.

    ‘So now, without my bifocals, I can barely read a menu without getting a headache.’
    • ‘I needed a pair of computer glasses as my bifocals cause me to have to get stiffnecked online looking down on the computer through the reading lenses.’
    • ‘The doctor looked at me again over his bifocals as he wrote something in his book.’
    • ‘He looked at me curiously over his bifocals, a sly smile on his face.’
    • ‘In that situation the user by repositioning the reading portion of his bifocals can see more clearly without tilting his head backwardly to permit him to look through the normal lower portion of his bifocals.’

Pronunciation

bifocal

/ˈbīˌfōk(ə)l/ /ˈbaɪˌfoʊk(ə)l/