Optician more important and dignified. Far-sighted or aging colonial Americans imported spectacles from Europe. Spectacles were primarily for the affluent and literate colonists, who required a valuable and precious appliance. Benjamin Franklin in the 1780s developed the bifocal. Bifocal lenses advanced little in the first half of the 19th century. The terms bifocal and trifocal were introduced in London by John Isaac Hawkins, whose trifocals were patented in 1827. In 1884 B. M. Hanna was granted patents on two forms of bifocals which become commercially standardized as the "cemented" and "perfection" bifocals. Both had the serious faults of ugly appearance, fragility,
Spectacles (product) export videos from the glasses in square or widescreen format, making sharing to other social networks that don't support the circular format much easier. According to an article by Alex Heath of CNBC's Cheddar published on Nov 20th, Snap is planning to release a new version of its Spectacles glasses with two cameras and a higher price point of $350 by the end of 2018. 'The new Spectacles, internally codenamed Newport, will feature an all-new design with a more premium frame made of aluminum and cameras capable of producing augmented reality effects in videos. By utilizing two cameras, the Snapchat