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  2. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses have one focal length, but it is variable without having to change where one is looking. Possible uses for such glasses are to provide inexpensive eyeglasses for people from low-income groups, developing countries, third world countries or to accommodate for presbyopia.

  3. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions.A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.

  4. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    The typical progressive lens is produced from a so-called semi-finished lens. The semi-finished lens is molded with an asymmetrical power pattern on the front. On the back side a custom surfacing is made to adjust the power for each patient. This method is however problematic, especially for astigmatic prescriptions.

  5. We’ve Found 100 Products That Pandas Keep Coming Back ... - AOL

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    Review: "The ability to adjust these as tight as you need is a vast improvement over the typical type of bed sheet holders which never adjust tight enough to work well. Highly recommend. Highly ...

  6. I tried those Pair Eyewear glasses with the magnetic ... - AOL

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    Still, there's no denying the appeal of glasses that can change colors and styles in an instant. And if you use the YAHOO15 code, you can get tops for closer to $21 — a little more palatable.

  7. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...

  8. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.

  9. Trump Wants To Eliminate Income Taxes: 5 Ways This Could ...

    www.aol.com/trump-wants-eliminate-income-taxes...

    Some states could make up the difference by implementing higher state sales taxes on everyday items, often referred to as a “consumption tax.” According to data from the Tax Foundation , 45 ...

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