As of July 2020, the price of a replacement eyeglass frame varies widely, depending on the quality of the glasses, the material, and so on. It can range from a few dozen dollars to thousands of dollars.
He grew up studious, when he saw that people with poor eyesight were in pain, but "single-photo" lenses and other inconvenient to use. So he carefully developed a kind of lens that can always be put on the glasses. After repeated trials, he used mechanical principles to create a lens grinding machine - the draw car.
This draft car, is the so-called classical method of processing the water orange, is a foot pedal rotation, the use of ore sand, white clay, brick ash, etc. as abrasive or polishing materials, grinding the lens into a convex-concave lens to adapt to the eye refractive needs, and finally finally mastered the technology of grinding tablets, with natural crystal stone grinding out of the lenses.
Industry Formation:
In the history of China, with the development of individual handicrafts, the material used for eyeglasses was developed from natural crystal stone to the use of glass, the use of eyeglasses began to be promoted to the people and expanded, and there were new developments in the production technology.
China's Gusu (Suzhou) is the birthplace of China's eyeglasses, the production of eyeglasses in Suzhou not only has a long history, but also the development of China's eyeglasses industry has played a great role in promoting. In the early years of the Ming Dynasty Chongzhen (1628 AD), Suzhou glasses history mountain now an outstanding technician named Sun Yunqiu, the word Wenyu, and the word Sibin, originally from Wujiang.