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Types. The FDA classifies soft contact lenses into four groups for the US market. They are also subcategorized into 1st generation, 2nd generation, and 3rd generation lens materials. [6] These 'water-loving' soft contact lens materials are categorized as "Conventional Hydrophilic Material Groups ("-filcon"): Group. Water Content.
The first Biogon lens (2.8 / 3.5 cm, an asymmetric design featuring seven elements in four groups) was designed in 1934 by Ludwig Bertele [1] while he was working for Zeiss, as a modification of his earlier Sonnar design (1929). [3] : 120 The Biogon was assigned to Zeiss Ikon Dresden and marketed with the Contax rangefinder camera.
standard accessory shoe with separate bulb and electronic flash connectors. General. Dimensions. 138 x 77 x 33.5mm. Weight. 560g. The Leica M2 is a 35 mm rangefinder camera by Ernst Leitz GmbH of Wetzlar, Germany, introduced in 1957. Around 82,000 M2s were produced between 1957 and 1968. Around 1500 M2s were produced by Ernst Leitz Canada, but ...
Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [1] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [2] In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion. [3]
Socializing and meeting new people can help your brain function. “Making new friends is positive, because it’s new information, so it’s a new kind of stimulation,” says Karlene Ball, Ph.D ...
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