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Cohen's Fashion Optical was the first to offer on-premise eye examinations with qualified Doctors of Optometry. [citation needed] On March 3, 2008, Houchens Industries completed its acquisition of Cohen's with hopes of expanding the regional optical retail chain into a national chain. The current president, Robert Cohen remained as president of ...
Specsavers Optical Group Limited [1] is a British multinational optical retail chain, which operates mainly in the UK, Ireland, Australia, New Zealand, Canada, and the Nordic countries. The chain offers optometry and optician services for eyesight testing and sells glasses , sunglasses , and contact lenses .
Transitions Optical is a U.S.-based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [2]
Automated optical inspection (AOI) is an automated visual inspection of printed circuit board (PCB) (or LCD, transistor) manufacture where a camera autonomously scans the device under test for both catastrophic failure (e.g. missing component) and quality defects (e.g. fillet size or shape or component skew). It is commonly used in the ...
LensCrafters Optique store in Sherway Gardens, Toronto, Canada LensCrafters Optique store in Ann Arbor, MI. LensCrafters is an international retailer of prescription eyewear and prescription sunglasses.
Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...
Eyeglass lenses are commonly made from plastic, including CR-39 and polycarbonate. These materials reduce the danger of breakage and weigh less than glass lenses. Some plastics also have more advantageous optical properties than glass, such as better transmission of visible light and greater absorption of ultraviolet light. [6]
One must bear in mind that the human eye itself has an Abbe number V d ≈ 50.2 so the expensive, high-end optical glass types mentioned above have little value for central vision; however, the wearer's view through the side of a glass lens is not comparable to central vision through the eye: Low dispersion glass definitely makes optically ...
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