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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 Glasses and How Do They Work?
    Varifocal glasses contain lenses that correct your vision at every distance, from reading a book to watching TV across the room, all in a single pair of glasses with no visible lines
  • 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 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
  • Learn How Varifocal Glasses Work | Buying Guide | Glasses Direct
    What are varifocal lenses? Varifocal lenses combine multiple prescriptions into a single lens This makes them ideal for people with presbyopia (age-related changes in near vision) They’re designed to support your full range of vision needs — near, intermediate, and distance — without visible lines in the lens
  • Varifocal Lenses | Varifocal Glasses | Specsavers UK
    Varifocal lenses allow you to see at any distance, because they have different sections for viewing close up and far away and everything in between So whether you’re driving, using a computer, shopping or reading, you can wear one pair of varifocals to accommodate all your vision needs
  • 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
  • Getting Used to Varifocal Lenses: What to Expect
    Switching to varifocal lenses can dramatically improve your vision by providing seamless sight at all distances — near, intermediate, and far But for many first-time users, there’s a short adjustment period as your eyes and brain learn to navigate the new zones
  • Varifocal lenses for several different configurations | Opto Engineering
    Varifocal lenses are lenses with variable focal length (and thus angle of view), which can be adjusted by moving groups of optical elements with respect to each other inside the lens
  • What are varifocal lenses? | Specsavers UK
    These are multifocal lenses that correct vision at different working distances, from reading distance to far distance Unlike bifocals, they have a gradual change in prescription and don't have visible lines that separate the segments, so they look just the same as single vision lenses





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