While most people today see a pair of glasses as rather common, people of ancient times regarded it a life-changing invention. According to history books, it was in the early 13th century Italy where the first appearance of a pair of eyeglasses was first documented. Still, historians believe that the eyeglasses was a product of continuous development, rather than a specific invention per se. In fact, they believe that the idea originated from rock-crystal stone magnifier used in ancient times to enhance images.
Years passed and the idea of creating two identical glass discs (with similar magnifying effect) connected together gave birth to the early pair of eyeglasses. Head on over to ExcelEye.com blog page to know more. http://bit.ly/2icLer3