According to written records, Zhang Ning in Ming Dynasty mentioned two pairs of glasses he had seen in his works. Zhang Ning was a scholar in 1454. At the same time, at the end of 16, Luo Maodeng wrote in the fiftieth chapter of the book The Biography of Three Treasures Eunuchs to the West: In the eighth year of Yongle (14 10), the king of Malaga paid "ten pieces".
King Malaga refers to the Malacca dynasty. In the eighth year of Yongle (14 10), the king of Malacca dynasty paid ten cups of tribute. Therefore, it can be said that glasses have been introduced to China for 600 years.
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The Origin of Glass in China
China Gusu (Suzhou) is the birthplace of China glasses. Suzhou's glasses production not only has a long history, but also plays a great role in promoting the development of China's glasses industry. In the early years of Chongzhen in the Ming Dynasty (A.D. 1628), an outstanding technician Sun, also known as Si Bin, was born in Wujiang.
He has been studious since he was a child. At that time, it was painful for him to see people with poor eyesight, but it was inconvenient to use a "single lens" mirror or the like. So he carefully developed a kind of lens that can often be placed on glasses. After repeated experiments, he invented and created a lens grinder-tractor by using mechanical principle.
This tractor, the so-called water orange processed by the classical method, uses the pedal to rotate, and uses mineral sand, white mud and brick ash as abrasives or polishing materials to grind the lenses into convex and concave lenses to meet the needs of eye refraction. Finally, it mastered the grinding technology. Grinding lenses with natural crystal stone.
At the same time, he mastered the "aiming light" (optometry) technology, developed lenses with various luminosity such as presbyopia, myopia and hyperopia according to people's age and vision, and compiled an original "aiming at the mirror with eyes" optometry method to check the environment.
In this way, the glasses can fit the eyes, the effect is not bad at all, and it is more convenient and comfortable to wear on the face to meet everyone's vision needs. This is the beginning of independent optometry in China.
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