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,
Tashkent (1784) Tashkent (1784) Tashkent State, or simply Tashkent was an independent historical secessionist state in Central Asia, which constituted nowadays Tashkent Region as well as South Kazakhstan Region. It was declared in 1784 and ceased to exist in 1808, after being occupied by the Kokand Khanate. The capital of the country was Tashkent. In the middle of the 18th century, a troubled period occurred in the history of Tashkent, when the city was at the crossroads of the interests of the Kalmyk Khanate, Kazakh Khanate, Kokand Khanate, and, to a lesser extent, Emirate of Bukhara. The city repeatedly passed from one