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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. 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 ...

  4. Pinhole (optics) - Wikipedia

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

    This effect is also used in pinhole occluders, which are used by ophthalmologists, orthoptists, and optometrists to test visual acuity. The same principle has also been applied as an alternative to corrective lenses : a screen of pinholes is mounted on an eyeglass frame and worn as pinhole glasses .

  5. 5 symptoms men over 40 should never ignore - AOL

    www.aol.com/finance/5-symptoms-men-over-40...

    Research shows men are more likely than women to avoid—or delay—necessary medical care, even when their symptoms disrupt their lives or become chronic. An online survey conducted by the ...

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

    www.aol.com/lifestyle/tried-those-pair-eyewear...

    Pair offers only about 10 frame styles each for men and women, with five available for kids. But you can choose from dozens of top options, everything from solid colors to holiday themes to "sun ...

  7. 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]

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