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  2. Toric lens - Wikipedia

    en.wikipedia.org/wiki/Toric_lens

    Toric lens surface as "cap" (top-right) from a torus (here with R = 1.2 r ). A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical.

  3. Hakim Optical - Wikipedia

    en.wikipedia.org/wiki/Hakim_Optical

    Hakim Optical in Richmond Hill. Karim Hakimi, a native of Iran, learned to make lenses from old window glass as a child. After a stint in the navy, Hakimi worked in the optical industry in Switzerland. He then migrated to Canada and opened an optical laboratory in the former Elmwood Hotel (now the Elmwood Spa) in downtown Toronto, Ontario.

  4. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    Vertex distance. Vertex distance. Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing ...

  5. Costco - Wikipedia

    en.wikipedia.org/wiki/Costco

    Costco Wholesale Corporation (commonly shortened to Costco) is an American multinational corporation which operates a chain of membership-only big-box warehouse club retail stores. [4] As of 2021, Costco is the third-largest retailer in the world [5] and is the world's largest retailer of choice and prime beef, organic foods, rotisserie chicken ...

  6. American Optical Company - Wikipedia

    en.wikipedia.org/wiki/American_Optical_Company

    The lenses were made to a joint standard shared by the U.S. Army Air Corps and the U.S. Navy. As a result, the lens carried an "AN" (Army/Navy) specification number: AN6531. The U.S. Government specified the shape of the lens and the color, which was initially a green-tinted lens that transmitted 50% of incoming visible daylight.

  7. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia.

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