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) Snapchat. On October 2015, a video leaked online showed an early version of the new glasses, dubbed "Spectacles". Furthermore, news outlets reported employee hirings from companies such as from Microsoft, Nokia and Qualcomm and Snap Inc. CEO Evan Spiegel was seen wearing the prototype in public according to a report by "Business Insider" in June. After Snapchat Inc.'s rebrand to Snap Inc. on September 24, 2016, the product was unveiled and announced on the same day. The product was released on November 10, 2016 when the first Snapbot, a proprietary vending machine for the smartglasses, was located near Snap's headquarters