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  2. American Optical Company - Wikipedia

    en.wikipedia.org/wiki/American_Optical_Company

    Founded in 1833 by William Beecher, AO was later bought by fellow apprentice Robert H. Cole who became the largest shareholder and first president of the company. [1] When he retired in 1891 and Beecher died in 1892, the volume of production was about two million frames and a million pairs of lenses per year.

  3. 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 ...

  4. The Girl I Like Forgot Her Glasses - Wikipedia

    en.wikipedia.org/wiki/The_Girl_I_Like_Forgot_Her...

    The Girl I Like Forgot Her Glasses (好きな子がめがねを忘れた, Suki na Ko ga Megane o Wasureta) is a Japanese manga series written and illustrated by Koume Fujichika. The series was first published on Fujichika's Twitter account in April 2018, before being serialized in Square Enix 's Monthly Gangan Joker magazine from November 2018 ...

  5. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.

  6. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    The gradient starts at the wearer's distance prescription at the top of the lens and reaches a maximum addition power, or the full reading addition, at the bottom of the lens. The length of the progressive power gradient on the lens surface depends on the design of the lens, with a final addition power between 0.75 and 3.50 dioptres .

  7. Drug coupon - Wikipedia

    en.wikipedia.org/wiki/Drug_Coupon

    Generic drug companies rarely offer coupons, though insurance companies occasionally offer discounts on generic drugs. [2] In addition PBMs (Pharmacy Benefit Managers) offer discount cards that act similarly to coupons. These cards work for both generic and brand medications and can save cash paying customers up to 75% on their prescription ...

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