About the origin of the prescription glasses, there are two opinions.

The first one: in the middle of the 13th century, there was a British scholar – Bacon. He saw many people’s vision were so poor that they couldn’t see the words of the book. Hence, he wanted to create a tool to help people improve eyesight. For this, he came up with a lot of methods and did a lot of experiments, but without success. One day after the rain, Bacon came into the garden for a walk and saw the cobweb with a lot of rain. And then he found that the leaf veins became larger when he saw it through the raindrop. » Read more: The origin of prescription glasses