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) in Venice, Los Angeles. By the end of 2017, the demand for the product had not met initial expectations. Snap wrote off $40 million worth of unsold inventory and unused parts. It sold 220,000 pairs as of May 23, 2018. In April 2018 the company launched Spectacles 2.0. Updates to the product included a new Spectacles look with more colors, the option of mirrored lenses and the removal of the bright yellow ring around the camera window. The weight of the glasses was made lighter and more comfortable. In June 2018, Snap released an update for Spectacles allowing users to