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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.
Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a ...
Essilor International is an international ophthalmic optics company that designs, manufactures and markets lenses to correct or protect eyesight. [ 1] Its headquarters is in Charenton-le-Pont (near Paris), France . It is the world's largest manufacturer of ophthalmic lenses. [ 2]
Pentaceraster cumingi. ( Gray, 1840) Pentaceraster cumingi, sometimes known as the Panamic cushion star, Cortez starfish or knobby star (a name also used for other species), is a species of starfish in the family Oreasteridae. It is found in warmer parts of the East Pacific ( Gulf of California to northwest Peru, including offshore islands like ...
The Micro Four Thirds system(MFT) of still and video camerasand lenses was released by Olympusand Panasonicin 2008; lenses built for MFT use a flange focal distanceof 19.25 mm, covering an image sensorwith dimensions 17.3 × 13.0 mm (21.6 mm diagonal). MFT lenses have been produced by many companies under several different brands, including ...
Varifocal lens. A varifocal lens is a camera lens with variable focal length in which focus changes as focal length (and magnification) changes, as compared to a parfocal ("true") zoom lens, which remains in focus as the lens zooms (focal length and magnification change). Many so-called "zoom" lenses, particularly in the case of fixed-lens ...
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