Optician in the context of "Ophthalmologist"

Zeiss (/zaɪs/ ZYSE; German: [kaʁl ˈtsaɪs]) is a German manufacturer of optical systems and optoelectronics, founded in Jena, Germany, in 1846 by optician Carl Zeiss. Together with Ernst Abbe (joined 1866) and Otto Schott (joined 1884) he laid the foundation for today's multinational company. The current company emerged from a reunification of Carl Zeiss companies in East and West Germany with a consolidation phase in the 1990s. ZEISS is active in four business segments with approximately equal revenue (Industrial Quality and Research, Medical Technology, Consumer Markets and Semiconductor Manufacturing Technology) in almost 50 countries, has 30 production sites and around 25 development sites worldwide.

Carl Zeiss AG is the holding company for all subsidiaries within the Zeiss Group, of which Carl Zeiss Meditec AG is the only one that is traded on the stock market. Carl Zeiss AG is owned by the Carl-Zeiss-Stiftung foundation. The Zeiss Group has its headquarters in southern Germany, in the small town of Oberkochen, with its second largest, and founding site, being Jena in eastern Germany. Also controlled by the Carl-Zeiss-Stiftung is the glass manufacturer Schott AG, located in Mainz and Jena. Carl Zeiss is one of the oldest existing optics manufacturers in the world.

James Ayscough /ˈæsˌkjuː/ (born 1720, died 1759) was an English optician and designer and maker of scientific instruments. He was apprenticed to an optician named James Mann from 1743 to 1747. James Ayscough became known for his microscopes. His shop was in London between 1740 and 1759. Around the year 1752, James Ayscough introduced spectacles with double-hinged side pieces. Although he made clear lenses, he recommended lenses tinted blue or green to treat some vision problems. These spectacles with tinted lenses are believed to be the precursors to sunglasses.

In February 1755 he began to contribute to the Gentleman's Magazine a daily register of the weather, month by month. It included barometric reading of pressure, and two temperature readings, in the early afternoon, and late in the evening. There was also a brief comment on the day's weather. He may have begun the record with instruments that the magazine already owned, (as it had been recording pressure and temperature sporadically since 1747, initially printed at the end of the monthly stock market report.) Initially barometric pressures were read to one-tenth of an inch, but that soon changed to 1/100, suggesting that he made his own instrument. His published register attracted the attention of George Smith near Carlisle, who began to contribute a matching record for Cumberland. This continued until Ayscough's death in 1759; his last entry in his record at London (Clerkenwell) was 23 August 1759.