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An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
Phoroptor is a registered trademark currently owned by Reichert Technologies, filed Apr 25, 1921, by DeZeng Standard of New Jersey, with the USPTO, serial number 71146698. The word was coined at that time for the newest version of their phoro-optometer. DeZeng was purchased in 1925 by American Optical of Massachusetts, which continued to market ...
The serial number on a Kodak manufactured lens is always preceded by a code consisting of two capital letters that indicates the year of manufacture using a 10 letter key word, CAMEROSITY, in which each letter in the word represents a corresponding numeral in the sequence 1234567890.
Essilor is the world's largest manufacturer of ophthalmic lenses. [3] The company innovated Varilux, the world's first progressive lens, which corrects presbyopia and grants the wearer quality distance, intermediate, and near vision. [1][4]
Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.
The lens received a new name Helios-44-2, and the body became completely black. Production began in 1967 - this year Zenit-E switched to a threaded mount on the m42. Externally, the serial number began to be applied to the ring with the name. In 1969, Helios-44-2 was mastered in Valdai.
Rodenstock GmbH (German pronunciation: [ˈʁoːdn̩ʃtɔk]) is a German manufacturer of ophthalmic lenses and frames for eyeglasses. The company, which was founded by Thuringian Josef Rodenstock in 1877, is headquartered in Munich.
The lenses were made to a joint standard shared by the U.S. Army Air Corps and the U.S. Navy. As a result, the lens carried an "AN" (Army/Navy) specification number: AN6531. The U.S. Government specified the shape of the lens and the color, which was initially a green-tinted lens that transmitted 50% of incoming visible daylight.
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