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  2. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.

  3. Readerest - Wikipedia

    en.wikipedia.org/wiki/Readerest

    In 2010, Hopper made prototypes using paperclips and magnets, solving the problem he had with trying to keep his glasses safe and secure. [1] It did not take long for consumer interest to grow. Friends, family, and strangers would ask him about his ReadeREST and wanted their own.

  4. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    Adaptation to the small field of view offered by the reading segment of bifocals can take some time, as the user learns to move either the head or the reading material rather than the eyes. Computer monitors are generally placed directly in front of users and can lead to muscle fatigue due to the unusual straight and constant movement of the ...

  5. Here's what AOL readers are buying during the Cyber Monday ...

    www.aol.com/lifestyle/heres-what-aol-readers-are...

    It's perfect for connecting to your WiFi and watching TV, reading books, playing games, and FaceTiming the grandkids. $259 at Walmart Apple AirPods Pro 2 for $154 ($31 off)

  6. 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.

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