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  2. Intraocular lens - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens

    Once implanted, IOLs have three major benefits. First, they are an alternative to the excimer laser procedure (LASIK), a form of eye surgery that does not work for people with serious vision problems. Effective IOL implants also eliminate the need for glasses or contact lenses post-surgery for most patients. [5]

  3. Canon AE-1 - Wikipedia

    en.wikipedia.org/wiki/Canon_AE-1

    The inner lens barrel remains stationary, and thus the signal levers and pins still do not rotate. During the late 1970s, there were over 50 Canon FD lenses available for purchase. They ranged from a fisheye FD 15 mm f/2.8 SSC to a FD 800 mm f/5.6 SSC, plus special purpose lenses such as a 7.5mm circular fisheye and a 35 mm tilt and shift lens.

  4. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    Cost: Progressive lenses are more expensive than bifocal and single-vision lenses due to higher manufacturing and fitting costs. Some research has been conducted to reduce the fabrication cost by precision injection molding. [6]

  5. Cataract surgery - Wikipedia

    en.wikipedia.org/wiki/Cataract_surgery

    Cataract surgery, also called lens replacement surgery, is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. [1] The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant.

  6. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    Graphite flakes can cost around US$0.9/kg carbon. [20] Price of synthetic industrial diamond for grinding and polishing can range from 1200 to 13 300 USD/kg, while cost per weight of large synthetic diamonds for industrial applications can be on the order of million dollars per kilogram. [21] 7: N: Nitrogen: 0.0012506: 19 (5.263 × 10 17 kg) 0. ...

  7. Ray-Ban - Wikipedia

    en.wikipedia.org/wiki/Ray-Ban

    Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb.The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million.

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