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Varilux. Varilux is a brand name belonging to Essilor International, a producer of corrective lenses. The first version of the lens was invented by Bernard Maitenaz and released in 1959, and was the first modern progressive lens to correct presbyopia. The progressive lens is characterized by correcting near, intermediate and far vision.
Bernard Maitenaz, patented Varilux in 1953, and the product was introduced in 1959 by Société des Lunetiers (now Essilor). The first Varilux lenses' surface structure was however still close to a bifocal lens, with an upper, aberration-free half of the surface for far vision and a rather large "segment" for clear near vision.
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 ...
Silo is an American science fiction dystopian drama television series created by Graham Yost, based on the Silo trilogy of novels (Wool, Shift, and Dust) by author Hugh Howey.
Sadly, the Alpine Mastiff's numbers dwindled due to crossbreeding with other large breeds, such as the Saint Bernard and the English Mastiff. By the late 19th century, the purebred Alpine Mastiff ...
Myth #1: Your brain stops growing at a certain age. Scientists used to think that the brain stopped developing after adolescence. But we now know that your brain can change and develop at any age ...
A group of ancient three-eyed reptiles, from a species that dates back before the dinosaurs, have been welcomed at a zoo. The reptiles, called tuataras, have moved into a new habitat at Chester ...
Top view of Bessamatic Deluxe camera with Color-Skopar X lens. The leaf shutter is a Synchro-Compur unit mounted behind the interchangeable lens, which uses the DKL-mount, although lenses made for the Bessamatic are not generally compatible with other DKL-mount cameras, and the Bessamatic DKL-mount will not generally accept non-Voigtländer lenses without physical modifications.
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