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  2. Pinhole glasses - Wikipedia

    en.wikipedia.org/wiki/Pinhole_glasses

    Unlike conventional prescription glasses, pinhole glasses produce an image without the pincushion effect around the edges (which makes straight lines appear curved). While pinhole glasses are claimed to be useful for people who are both near- and far-sighted, they are not recommended [citation needed] for people with over 6 diopters of myopia.

  3. Glasses are 50% off at GlassesUSA during Black Friday: Frames ...

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    Get a new pair of glasses as low as $26 at GlassesUSA during Black Friday week. Shop high-end brands like Ray-Ban or more affordable brands—they're all on sale. ... 60% off designer brands, and ...

  4. Distortion (optics) - Wikipedia

    en.wikipedia.org/wiki/Distortion_(optics)

    In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image.It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an ...

  5. Presbyopia - Wikipedia

    en.wikipedia.org/wiki/Presbyopia

    Glasses prescribed to correct presbyopia may be simple reading glasses, bifocals, trifocals, or progressive lenses. [4] People over 40 are at risk for developing presbyopia and all people become affected to some degree. [1] An estimated 25% of people (1.8 billion globally) had presbyopia as of 2015. [3]

  6. These are the top 100+ gifts of 2024, according to Amazon - AOL

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    Updated December 11, 2024 at 12:40 PM. ... The 50 best Christmas gifts for women in 2024; AOL. The very best gifts for men, from $2 to over $100; AOL.

  7. Don't wait until Black Friday: Amazon deals dropped ... - AOL

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    $60 $100 Save $40 Water flossers can make a huge impact on your oral health, and during Black Friday, our favorite brand is offering big discounts on its flossers. This Waterpik is down to less ...

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