Who was Friar Giordano da Pisa ?

Giordano da Pisa (1255-1311) was a Dominican friar and theologian in Italy. He was one of the most popular preachers at this time and gave sermons both in Italian and in Latin in many different places such as Venice, Florence and his home town Pisa. Many of his Italian sermons were collected and recorded by his loyal followers. Strangely, none of his Latin sermons has survived.

https://en.wikipedia.org/wiki/Jordan_of_Pisa

Giordana da Pisa is also the first preacher whose vernacular Italian sermons are preserved. As a result, eyeglasses often are attributed to him, but he didn't actually invent them. Instead, one of his surviving sermons from 1306 mentions that the invention of eyeglasses had taken place 20 years previously. In the sermon, he said, "I've seen the man who, before anyone else, discovered and made a pair of glasses, and I spoke to him." However, the identity of the actual inventor is unknown -- although the subject of centuries of speculation. But Giordana de Pisa's reference is the first clear historical reference to them, and his name is always mentioned in connection with their invention, as the Wikipedia link illustrates.

http://scienticity.net/wiki/The_Invention_of_Eyeglasses
https://en.wikipedia.org/wiki/Glasses#Invention