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) proprietary pop-up vending machine developed and manufactured by Snap Inc. It is designed for the exclusive distribution of Spectacles and is randomly placed anywhere in the world for the duration of a day, with the exception of Venice, Los Angeles, as well as a previous location in New York City, operating through a pop-up store. The machine has three buttons for the Spectacles' color options: coral, black and teal and has a dispenser in the shape of a semicircle-esque smile. It allows the person to virtually "try on" the glasses using Snapchat's lens technology and the dispenser illuminates when the