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Hoya Corporation. Hoya Corporation (Hoya株式会社, Hōya Kabushiki-gaisha) is a Japanese company manufacturing optical products such as photomasks, photomask blanks and hard disk drive platters, contact lenses and eyeglass lenses for the health-care market, [4] medical photonics, [5] lasers, photographic filters, medical flexible endoscopy ...
Hoya is the world's second-largest eyeglass lens maker, with about 90% of its eyewear lens sales earned from outside of Japan, according to its latest annual report.
Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
Pentax Corporation (ペンタックス株式会社, Pentakkusu Kabushiki gaisha) was a Japanese camera and optical equipment manufacturer, and currently, it exists as the Pentax Life Care Business Division of Hoya 's medical endoscope business, as well as the digital camera brand of Ricoh Imaging, a subsidiary of Ricoh . Pentax, founded in 1919 ...
In 1966 Asahi Optical showed another prototype called Metallica, [16] sometimes referred to as Metallica II. Gone was the cumbersome selenium light meter, replaced with a now standard internal CdS meter. Like the 1960 prototype, the Metallica had a bayonet lens mount, and also featured an improved Copal-square metallic shutter.
Intraocular lens. An Intraocular lens ( IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short sightedness and long sightedness; a form of refractive surgery. If the natural lens is left in the eye, the IOL is known as phakic, otherwise it is a pseudophakic lens (or ...
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