Definition of bifocal in English:



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

    • ‘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.’
    • ‘This restricted the movement of her head which reduced her ability to use her bifocal glasses.’
    • ‘Three different designs for bifocal contact lenses exist: simultaneous, concentric and alternating vision.’
    • ‘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.’
    • ‘Therefore, a bifocal relay mirror effectively puts the laser source at the mirror.’
    • ‘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 contact lenses, like bifocal glasses, provide distance and close-up correction on each contact.’
    • ‘The multiple vision lenses include bifocal lenses for near and distant vision.’
    • ‘There is no one ‘best’ soft bifocal contact lens.’
    • ‘Most people can't see a crisp 20/20 at near or far distances with our current generation of bifocal contact lenses.’
    • ‘Alternatively, some people use varifocal or bifocal lenses in order to see objects clearly that are both close up and far away.’
    • ‘The teacher was a cheery middle-aged woman with black hair and rather thick bifocal glasses.’
    • ‘Back home, he made one more great contribution to human felicity: bifocal glasses.’
    • ‘People with bifocal glasses are especially prone to neck aches because they may have to tilt their heads back to see things up close.’
    • ‘A friend told us this company was going to revolutionise bifocal contact lenses.’
    • ‘He wears bifocal glasses with gold rims and a black-faced watch.’
    • ‘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.’
    • ‘Soft lenses for daily wear have a very short adaptation period and are available in various tints and bifocal designs.’
    • ‘Without bifocal vision, he lacked depth perception and couldn't tell how far ahead of him horses were.’


  • A pair of glasses with bifocal lenses.

    • ‘Her eyes narrowed as she peered over her bifocals.’
    • ‘In 1760, Benjamin Franklin instructed a London firm to make him spectacles with two types of lenses fitted together, thus inventing bifocals.’
    • ‘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.’
    • ‘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.’
    • ‘He was responsible for breakthroughs like lighting = electricity, and inventions like bifocals and the Franklin stove.’
    • ‘The doctor looked at me again over his bifocals as he wrote something in his book.’
    • ‘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.’
    • ‘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.’
    • ‘Donald needs exciting and imaginative new policies, new advisors, new bifocals, the lot.’
    • ‘So now, without my bifocals, I can barely read a menu without getting a headache.’
    • ‘She had mousy brown hair with gray streaks pulled up into a tight bun, and she wore a pair of small bifocals.’
    • ‘He put on a pair of glasses with clear, thick lenses that looked like 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.’
    • ‘I watched him set frameless bifocals on the end of his nose.’
    • ‘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.’
    • ‘He looked at me curiously over his bifocals, a sly smile on his face.’
    • ‘I wear bifocals or reading glasses - can I still wear contact lenses?’
    • ‘I had just started feeling around my bedspread for the bifocals when Jack said, ‘Looking for these?’’
    • ‘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.’
    • ‘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.’
    • ‘One pastor went into the pulpit one Sunday morning wearing a pair of new 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.’
    • ‘Today on The Health Report, is there a prospect of being able to throw away reading glasses and bifocals?’
    • ‘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.’