Invention of Eye Glass.

In the 13th century, an English scientist named Roger Bacon, suggested that lenses could be used to see well.
But unfortunately he could never put two lenses together to make eyeglasses.
The first eyeglasses appeared in the city of Pisa in Italy during late 1280's when an unknown traveller showed people how to make eyeglasses.
Eyeglasses came to be invented in China too during the same time.
But here too, the inventor remained unknown.