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  2. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/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.

  3. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    An even number is an integer that is "evenly divisible" by two, that is divisible by two without remainder; an odd number is an integer that is not even. (The old-fashioned term "evenly divisible" is now almost always shortened to "divisible".) Any odd number n may be constructed by the formula n = 2k + 1, for a suitable integer k.

  4. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    One style is hard contact lenses, which can distort the shape of the cornea to a desired shape. Another style, soft contact lenses, are made of silicone or hydrogel. Depending on the duration they are designed for, they may be worn daily or may be worn for an extended period of time, such as for weeks. [32] There are a number of complication ...

  5. 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.

  6. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -⁠nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -⁠əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.

  7. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

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