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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. Zenni Optical - Wikipedia

    en.wikipedia.org/wiki/Zenni_Optical

    Zenni Optical (formerly 19dollareyeglasses.com) is an American online retailer of prescription glasses and sunglasses. Founded in 2003 by Tibor Laczay and Julia Zhen, it is based in Novato, California. The company sells more than 2,000 types of prescription glasses and sunglasses as well as 45 types of contact lenses. Zenni created theme glasses through collaborations with professional gamers ...

  4. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    A person's visual acuity is registered documenting the following: whether the test was for distant or near vision, the eye (s) evaluated and whether corrective lenses (i.e. glasses or contact lenses) were used: D (distant) for the evaluation done at 20 feet (6 m). N (near) for the evaluation done at 15.7 inches (400 mm).

  5. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

    www.aol.com/10-great-sites-buy-cheap-140036394.html

    Here are 10 affordable places to buy your next pair of cheap prescription glasses online. 1. Warby Parker. If you’re looking for a lot of choice (and the modern convenience of trying on eyeglass ...

  6. Pinhole glasses - Wikipedia

    en.wikipedia.org/wiki/Pinhole_glasses

    Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

  7. This Is What Those Numbers on Your Glasses Mean - AOL

    www.aol.com/lifestyle/why-know-those-numbers...

    For premium support please call: 800-290-4726 more ways to reach us

  8. Optical illusion can tell if you need glasses - AOL

    www.aol.com/news/2015-05-14-optical-illusion-can...

    If, at that distance, you see Marilyn Monroe you probably need glasses because Einstein's never looked that good. The optical illusion is making the rounds on social media, and you can see why.

  9. Bioptics (device) - Wikipedia

    en.wikipedia.org/wiki/Bioptics_(device)

    Bioptics (device) Bioptics, also known as a bioptic in the singular, and sometimes more formally termed a bioptic telescope, is a term for a pair of vision -enhancement lenses. They magnify between two and six times, and are used to improve distance vision for those with severely impaired eyesight, especially those with albinism.

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