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  2. 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 ...

  3. Who Is Actually Behind Costco's Kirkland Signature Products - AOL

    www.aol.com/actually-behind-costcos-kirkland...

    Secret Stash. If you don’t know Kirkland Signature, Costco’s white label house brand, you should if you want quality at a discount. Just about everything Kirkland sells is a home run, and much ...

  4. Porro prism - Wikipedia

    en.wikipedia.org/wiki/Porro_prism

    Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°.

  5. Achromatic lens - Wikipedia

    en.wikipedia.org/wiki/Achromatic_lens

    In theory, the process can continue indefinitely: Compound lenses used in cameras typically have six or more simple lenses (e.g. double-Gauss lens); several of those lenses can be made with different types of glass, with slightly altered curvatures, in order to bring more colors into focus.

  6. Prism adaptation - Wikipedia

    en.wikipedia.org/wiki/Prism_Adaptation

    Prism adaptation can be used to rehabilitate the visuo-spatial deficits of neurological disorders such as unilateral neglect.It has become clear that with respect to being used as a long-term rehabilitative tool, prism adaptation is only effective when it is repeated over many sessions and with sufficiently strong prism goggles (Newport and Schenk, 2012).

  7. Walmart Canada - Wikipedia

    en.wikipedia.org/wiki/Walmart_Canada

    Walmart Canada is a Canadian retail corporation and the Canadian branch of the U.S.-based multinational retail conglomerate Walmart.Headquartered in Mississauga, Ontario, it was founded on March 17, 1994, with the purchase of the Woolco Canada chain from the F. W. Woolworth Company.

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