Definition of bifocal in English:

bifocal

adjective

  • Denoting a lens having two parts each with a different focal length, one for distant vision and one for near vision.

    • ‘A friend told us this company was going to revolutionise bifocal contact lenses.’
    • ‘People with bifocal glasses are especially prone to neck aches because they may have to tilt their heads back to see things up close.’
    • ‘Alternatively, some people use varifocal or bifocal lenses in order to see objects clearly that are both close up and far away.’
    • ‘Soft lenses for daily wear have a very short adaptation period and are available in various tints and bifocal designs.’
    • ‘He wears bifocal glasses with gold rims and a black-faced watch.’
    • ‘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.’
    • ‘Bifocal contact lenses, like bifocal glasses, provide distance and close-up correction on each contact.’
    • ‘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.’
    • ‘Three different designs for bifocal contact lenses exist: simultaneous, concentric and alternating vision.’
    • ‘Without bifocal vision, he lacked depth perception and couldn't tell how far ahead of him horses were.’
    • ‘The teacher was a cheery middle-aged woman with black hair and rather thick bifocal glasses.’
    • ‘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.’
    • ‘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.’
    • ‘The multiple vision lenses include bifocal lenses for near and distant vision.’
    • ‘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.’
    • ‘Therefore, a bifocal relay mirror effectively puts the laser source at the mirror.’
    • ‘Back home, he made one more great contribution to human felicity: bifocal glasses.’
    • ‘This restricted the movement of her head which reduced her ability to use her bifocal glasses.’
    • ‘Accommodative effort and retinal blur can be minimised by bifocal glasses, which change the focal point for near work.’

noun

bifocals
  • A pair of glasses with bifocal lenses.

    • ‘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.’
    • ‘For instance, the first time you don a new pair of bifocals, there is a difference in what you perceive visually and what your hand does when you go to reach for something.’
    • ‘She had mousy brown hair with gray streaks pulled up into a tight bun, and she wore a pair of small bifocals.’
    • ‘In 1760, Benjamin Franklin instructed a London firm to make him spectacles with two types of lenses fitted together, thus inventing bifocals.’
    • ‘I had just started feeling around my bedspread for the bifocals when Jack said, ‘Looking for these?’’
    • ‘He put on a pair of glasses with clear, thick lenses that looked like bifocals.’
    • ‘I watched him set frameless bifocals on the end of his nose.’
    • ‘Her eyes narrowed as she peered over her bifocals.’
    • ‘I wear bifocals or reading glasses - can I still wear contact lenses?’
    • ‘He was responsible for breakthroughs like lighting = electricity, and inventions like bifocals and the Franklin stove.’
    • ‘Today on The Health Report, is there a prospect of being able to throw away reading glasses and bifocals?’
    • ‘So our aim is to restore the ability to change the focus in older people, so that they don't need reading glasses or bifocals.’
    • ‘He stared at Laurie over his bifocals, his balding head gleaming in the afternoon sun coming through the bay window at the end of the foyer.’
    • ‘The man's wrinkly face was barely visible behind his enormous bifocals and explosive gray facial hair, and the dark silk suit he was wearing was tailored to match his furniture.’
    • ‘One pastor went into the pulpit one Sunday morning wearing a pair of new bifocals.’
    • ‘Handing the packet to her, he shut his bag, and the nurse slipped on a pair of bifocals that had been hanging around her neck by a thin chain.’
    • ‘For me, the progressive or no-line bifocals have worked for years because you can position your head to bring objects into sharp focus at almost any distance.’
    • ‘This new refractive procedure is capable of reducing or even eliminating the need for bifocals or reading glasses for certain categories of patients.’
    • ‘He was a short, stout man who had long ago lost most of his hair and now had to keep his thick bifocals on a string around his neck or else he'd lose them too.’
    • ‘Donald needs exciting and imaginative new policies, new advisors, new bifocals, the lot.’

Pronunciation:

bifocal

/bʌɪˈfəʊk(ə)l/