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  2. Fundus photography - Wikipedia

    en.wikipedia.org/wiki/Fundus_photography

    Simultaneous stereo fundus photos have been published prior to 1909 however their use as a diagnostic tool is not widespread. [16] Recent advances in digital photography and 3D monitors has seen some manufacturers incorporating it once again into photographic equipment.

  3. Myopia - Wikipedia

    en.wikipedia.org/wiki/Myopia

    The prevalence of myopia has been reported as high as 70–90% in some Asian countries, 30–40% in Europe and the United States, and 10–20% in Africa. [130] Myopia is about twice as common in Jewish people than in people of non-Jewish ethnicity. [132] Myopia is less common in African people and associated diaspora. [129]

  4. 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 ...

  5. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    A bifocal lens with areas of differing magnification Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [].. Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances.

  6. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    Myopia or Nearsightedness: When the refractive power is too strong for the length of the eyeball, this is called myopia or nearsightedness. People with myopia typically have blurry vision when viewing distant objects because the eye is refracting more than necessary.

  7. Farsightedness - Wikipedia

    en.wikipedia.org/wiki/Farsightedness

    If the brain never learns to see objects in detail, then there is a high chance of one eye becoming dominant. The result is that the brain will block the impulses of the non-dominant eye. In contrast, the child with myopia can see objects close to the eye in detail and does learn at an early age to see objects in detail. [medical citation needed]

  8. All the most jaw-dropping wardrobe malfunctions of 2017 -- so far

    www.aol.com/entertainment/2017-06-06-celebrity...

    One time, she seemingly flashed her underwear in strapless dress with a sky-high slit. The second time around , she exposed her breasts in a super see-through number.

  9. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...

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