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Essel soon added frame design and trade to its activities. In 1955 Essel launched a frame design, Nylor, that is still used today. The Nylor system introduced thin nylon that surrounds the lens and is fixed to the frame's higher branch. Essel's breakthrough came in 1959 with the invention of Varilux, the first ophthalmic progressive lens.
In the end, Maintenaz's invention would be fixed between Essel's bifocal lens, the Diachrolux, and its trifocal lens, the Trilux. Without much brainstorming, Maintenaz's progressive lens was given a name following suit with the other premium products: Varilux. [7] The lens was launched officially in May 1959 at the Hotel Lutetia in Paris, France.
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Poly(allyl diglycol carbonate) (PADC) is a plastic commonly used in the manufacture of eyeglass lenses alongside the material PMMA (polymethyl methacrylate). The monomer is allyl diglycol carbonate (ADC). The term CR-39 technically refers to the ADC monomer, but is more commonly used to refer to the finished plastic.
Rimless glasses lenses are held in place (or "mounted") by way of a series of screws, or hollow plastic double rivets (called "bushings" or "compression plugs") that fit into two holes in the lens. When bushings are used, the temples and bridge have barbed metal pins that lock into the bushings, creating a pressure seal that holds the lenses in ...
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HCD lenses are optimized for slightly smaller image sensors covering 48×36 mm (1.9×1.4 in), [95] so the crop factor for HCD lenses is slightly greater at 0.72. With these sensors, an 80 mm lens would have the equivalent coverage of a lens with a focal length of approximately 60 mm on a "full-frame" camera.
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