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  2. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

  3. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

  4. List of most-liked YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-liked_YouTube...

    The music video for LMFAO's song "Party Rock Anthem" stood as the most-liked video on YouTube in 2012, with 1.56 million likes, until the video for Psy's "Gangnam Style" surpassed it in September that year with more than 1.57 million likes. Following this accomplishment, "Gangnam Style" entered the Guinness World Recordsbook as the most-liked ...

  5. List of most-viewed YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-viewed...

    The original video by Pinkfong is now the most viewed video on the site. On October 29, 2020, Baby Shark surpassed 7 billion views, and on November 2, 2020, it passed Despacito to become the most viewed video on YouTube. On February 23, 2021, Baby Shark surpassed 8 billion views, becoming the first video to do so.

  6. Graves' disease - Wikipedia

    en.wikipedia.org/wiki/Graves'_disease

    Graves' disease data has shown that the lifetime risk for women is around 3% and 0.5% for men. [39] It occurs about 7.5 times more often in women than in men [1] and often starts between the ages of 40 and 60. [6] It is the most common cause of hyperthyroidism in the United States (about 50 to 80% of cases). [1] [4]

  7. Prism (optics) - Wikipedia

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

    Prism (optics) A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base ...

  8. Optical coating - Wikipedia

    en.wikipedia.org/wiki/Optical_coating

    Optical coating. An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which the optic reflects and transmits light. These coatings have become a key technology in the field of optics. One type of optical coating is an anti-reflective coating, which ...

  9. List of YouTubers - Wikipedia

    en.wikipedia.org/wiki/List_of_YouTubers

    Videos surrounding feminism, critical thinking, religious skepticism, and scientific skepticism: Catherine Wayne: United States boxxybabee, ANewHopeee, bodaciousboxxy Popular for her YouTube comedy videos under the pseudonym "Boxxy". Fights between her supporters and her detractors lead to an "online war". Jesse Wellens and Jeana Smith: United ...

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