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) app will be able to overlay AR lenses and create 3D-like photo effects from footage taken by the Spectacles, the people said. The new hardware is intended to further CEO Evan Spiegel’s grand vision of eventually creating eyewear technology that seamlessly overlays virtual objects onto the real world.' The glasses consist of two separate houses within the sides of the frame for the battery and camera. The camera lens has a 115° field of view (110° on V2) and records in a circular format that adapts to a smartphone's screen size and orientation. The smartglasses record when the user presses