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After the Second World War, Bollé used molded nylon in the manufacturing process with sunglasses featuring protective lenses. The first pair of safety goggles and masks were added to the Bollé range of products in 1950 [ 4 ] and in 1956 Georges Bollé created the nylon "cat-eye" sunglass and the first cycling specific sunglasses, the Nylon ...
Serengeti sunglasses include tinted photochromic and polarized lenses. [ 4 ] Tucker Viemeister designed aviator style sunglasses in sepia tones for Serengeti in the 1980s.
The new entity will be worth around $50bn (£37bn), sell close to a billion pairs of lenses and frames every year, and have a workforce of more than 140,000 people." [ 34 ] On 1 October 2018 the new holding company EssilorLuxottica was founded, resulting in combined market capitalization of approximately €46.3 billion as of the date of the ...
The calculation of glass properties allows "fine-tuning" of desired material characteristics, e.g., the refractive index. [1]The calculation of glass properties (glass modeling) is used to predict glass properties of interest or glass behavior under certain conditions (e.g., during production) without experimental investigation, based on past data and experience, with the intention to save ...
Pre-operative measurements, including corneal curvature, axial length, and white-to-white measurements are used to estimate the required power of the IOL. These methods include several formulae, including Hagis, [32] Hoffer Q, [32] Holladay 1, [32] Holladay 2, [32] and SRK/T. [33] Free online calculators use similar input data. [32]
In 2009, Praputsorn Kosakarn described a method for manual fragmentation of the lens, called "double-nylon loop", which consists in splitting the lens into three pieces for extraction, allowing a smaller, sutureless incision of 4.0 to 5.0 mm (0.16 to 0.20 in), and requires implantation of a foldable IOL. This technique uses less expensive ...