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  2. 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.

  3. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    Optics and vision. Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images ...

  4. Astigmatism (optical systems) - Wikipedia

    en.wikipedia.org/wiki/Astigmatism_(optical_systems)

    An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- ( a-) meaning "without" and ...

  5. Luxottica - Wikipedia

    en.wikipedia.org/wiki/Luxottica

    Luxottica is the largest optical retailer in the United States, with 7.3% of US retail sales in 2015. With its merger with Essilor in 2018 the company owns Coastal/Clearly, an online contacts and glasses retail giant bought in 2014 that ships to over 200 countries beside its original North American market. [citation needed]

  6. Gradient-index optics - Wikipedia

    en.wikipedia.org/wiki/Gradient-index_optics

    The lens focuses light in the same way as a conventional lens. Gradient-index ( GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material. Such gradual variation can be used to produce lenses with flat surfaces, or lenses that do not have the aberrations typical of traditional ...

  7. Transitions Optical - Wikipedia

    en.wikipedia.org/wiki/Transitions_Optical

    Transitions Optical is a U.S. -based company known for manufacturing photochromic lenses. The company was founded in 1990. [1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [2] From inception the company has been a joint venture between PPG Industries (51%) and Essilor (49%).

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