Development and propagation of soft plastic presbyopic glasses
The small flexible plastic presbyopic glasses first appeared in Florence, Italy, in 1289.
Flexible plastic presbyterians were introduced to Europe in the 13th century by two Italian doctors and were not widely used until the middle of the 14th century. At the beginning of Europe also regard soft plastic presbytery as the adornment of distinction of high and low status.
The western regions
Soft plastic reading glasses to the western regions, the first called uwainat (Arabic), was introduced into China, after the transliteration of "Ai Dai",. The term "soft plastic presbyopic glasses" did not appear until the early qing dynasty.
During the Ming dynasty, soft plastic presbyterians were introduced to China from the western regions during the trade with the western regions. One of the earliest accounts of soft plastic reading glasses in the south at the end of the last Zhao Xigu wrote "land clear record" : "the old man the inconvenience of fine books, mesh with the Qu mystery yan Ming, they judged the yuan novel word Ai Dai out west."