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varifocal    
变焦距

变焦距


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  • What Are Varifocal Lenses? - eyecarecenter
    Varifocal lenses (also called progressive or multifocal lenses) are a specialty lens that corrects both near and distance vision
  • Varifocal lens - Wikipedia
    A varifocal lens is a camera lens with variable focal length in which focus changes as focal length (and magnification) changes, as compared to a parfocal ("true") zoom lens, which remains in focus as the lens zooms (focal length and magnification change)
  • Varifocals explained | Glasses Direct
    Varifocal lenses provide continuous vision for all distances in a single lens, and correct presbyopia The first patent for varifocal lenses (which are technically called Progressive Power Lenses - or PPL) was created in the early-20th century
  • Varifocals what are they, how do they work? - the Village Optician
    A varifocal gradually changes the power from the top by the pupils, all the way down to the very bottom of the lens, which has got the strongest reading power You've got the power there for every distance away from you
  • Varifocal Glasses Explained - [2025 UPDATED] - Online Opticians UK
    Varifocal glasses, also known as varifocals, varifocal lens, PAL,s or progressive lenses, have a gradual change in strength from the top of the lens to the bottom with multiple focal points in between This allows you to see all distances and focus points through just one lens
  • All about varifocals - ZEISS Vision Care
    Progressive lenses allow smooth, clear vision from near to far with one lens – without image jumps or transitions Dizziness, headache, a stiff neck, fatigue and constantly tripping when going up the stairs – there are many stories about the problems encountered by wearers as they get used to new progressive lenses
  • What Are Varifocal Lenses? - Nationwide Vision
    Varifocal lenses, also known as progressive or multifocal lenses, correct both near and distance vision This means that if you have presbyopia and other refractive errors like nearsightedness (myopia), farsightedness (hyperopia), or astigmatism, these lenses can help
  • How do varifocal lenses work? Pros, cons, and more - Lensmart
    Varifocal lenses are an upgrade to trifocal and bifocal lenses In most cases, these two traditional glasses have visible telltale lines in the lenses In contrast, varifocal lenses have a seamless look
  • Parfocal vs Varifocal Zoom: What is the Difference and Why Does it . . .
    Varifocal and Parfocal describe two different types of zoom lenses based on whether or not the focus is maintained when you change the focal length With varifocal lenses, as soon as you zoom the
  • A guide to wearing varifocals | Cubitts
    Varifocal lenses combine distance, near and intermediate prescriptions in a single lens, meaning the wearer can change focus from objects near to distant simply by moving their eyes, without having to change their spectacles





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