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  2. Boots Opticians - Wikipedia

    en.wikipedia.org/wiki/Boots_Opticians

    All of Boots Opticians' laser eye surgeries were bought by Optical Express in late 2004. [ citation needed ] On 29 January 2009, it was announced that Boots Opticians were to merge with Dollond & Aitchison , forming a chain of 690 stores and 5,000 staff after Boots purchased a controlling share in D&A. [ 5 ] [ 6 ] In May 2019, the company was ...

  3. Acuvue - Wikipedia

    en.wikipedia.org/wiki/Acuvue

    As a result, Acuvue was introduced to the market in 1987. The lens was originally indicated for seven-day extended wear and later became a daily wear lens. [4] Eventually the product line grew to range from the 1-day wear to two-week lenses such as the Acuvue 2 and Oasys and the Vita monthly lens.

  4. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.

  5. Essilor - Wikipedia

    en.wikipedia.org/wiki/Essilor

    After many years as rivals, Essel and Silor merged on 1 January 1972 to form Essilor, then the world's third-largest ophthalmic optical firm. [1] Its first year of existence was marked by the creation of Valoptec, a non-trading company composed of stockholder managers who held half the company's capital stock, and the purchase of Benoist-Bethiot, a French lens manufacturer specializing in ...

  6. Thin lens - Wikipedia

    en.wikipedia.org/wiki/Thin_lens

    A lens may be considered a thin lens if its thickness is much less than the radii of curvature of its surfaces (d ≪ | R 1 | and d ≪ | R 2 |).. In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the radii of curvature of the lens surfaces.

  7. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

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