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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 [ clarification needed ] progressive lens to correct presbyopia .
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.
The industry standard is to report Dk/t values measuring lens thickness at the center of a -3.00 D lens. [12] [13] The higher a contact lens wearer's prescription is, the thicker their lens is overall, which decreases Dk/t. Minus lenses are thicker away from the center, while plus lenses are thicker at the center, which decreases Dk/t in those ...
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 ...
Essilor and Luxottica were respectively the world's leading manufacturers of ophthalmic lenses and of eyeglasses; upon the merger, EssilorLuxottica thus became the juggernaut of the eyewear industry, which some critics have qualified of near monopoly. Essilor contributed its numerous proprietary lens technologies as well as its subsidiaries to ...
The earliest models of soft contact lenses, based on hydrogel material, had a level of oxygen permeability of around 6–8 Dk/t. [1] Polymacon , the material used in the first hydrogel contact lenses in some countries in the 1960s and approved by the FDA in the U.S. in 1971, has a Dk of 9 .
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