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  2. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    A simplest case is where thin lenses are placed in contact (=). Then the combined focal length f of the lenses is given by = +. Since 1/f is the power of a lens with focal length f, it can be seen that the powers of thin lenses in contact are additive. The general case of multiple thin lenses in contact is

  3. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power , added to the wearer's correction for the other refractive errors .

  4. Kamala Harris - Wikipedia

    en.wikipedia.org/wiki/Kamala_Harris

    Kamala Devi Harris [b] (born October 20, 1964) is an American politician and attorney who has been the 49th and current vice president of the United States since 2021, serving with President Joe Biden.

  5. Acuvue - Wikipedia

    en.wikipedia.org/wiki/Acuvue

    In 1981, Johnson & Johnson acquired Frontier Contact Lenses and renamed the company Vistakon. [1] The production process at the time of sale was very manual—every employee on the production line handled the lenses, whether they were lathing, polishing, or inspecting. Vistakon decided to invest in a new production process in order to scale.

  6. Bionic contact lens - Wikipedia

    en.wikipedia.org/wiki/Bionic_contact_lens

    Early embodiment of contact lens display, Canadian patent application 2280022, 1999 July 28th. A bionic contact lens is a proposed device that could provide a virtual display that could have a variety of uses from assisting the visually impaired to video gaming, as claimed by the manufacturers and developers. [1]

  7. United States dollar - Wikipedia

    en.wikipedia.org/wiki/United_States_dollar

    Discount window lending – banks can borrow from the Federal Reserve. Monetary policy directly affects interest rates; it indirectly affects stock prices, wealth, and currency exchange rates. Through these channels, monetary policy influences spending, investment, production, employment, and inflation in the United States.

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