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varifocal    
变焦距

变焦距


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  • 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)
  • What Are Varifocal Lenses? | eyecarecenter
    Varifocal lenses (also called progressive or multifocal lenses) are a specialty lens that corrects both near and distance vision
  • Varifocals explained | Glasses Direct ™
    Here we explain everything about varifocal lenses, including how they were first developed, the different types, and the pros of cons to using this lens Varifocal lenses provide continuous vision for all distances in a single lens, and correct presbyopia
  • 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
  • All about varifocals - ZEISS Vision Care
    These lenses are intended to provide you with excellent vision at all distances (near, far and middle distance) in a single lens
  • What Are Varifocal Lenses and Are They Worth It? – Specxsol
    What Are Varifocal Lenses? Varifocal lenses are specially designed to correct your vision at three distances in one lens – near, intermediate, and far – without the visible dividing line found in bifocals
  • Thanks to varifocals you only need one pair of glasses. Here’s how they . . .
    Varifocals are lenses that allow you to see close-up, far away and somewhere in between, all through the same pair of glasses Originally known as Varilux lenses, they were invented by engineer Bernard Maitenaz at a French spectacle company in 1959
  • Varifocal glasses - Vision Express
    Varifocal lenses have more than one prescription in each lens, meaning you can use the same pair of glasses or sunglasses for looking at short and long distances
  • How Do Varifocal Contact Lenses Work: A Complete Guide for Clear Visio
    Varifocal contact lenses, also known as multifocal or progressive contact lenses, are specialized vision correction devices designed to address multiple focal distances simultaneously
  • 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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