History 100 Questions (65) Hehe, what should the ancients do if they are myopic? (2) The problem of myopia in ancient China has also been known for a long time, but because there were no glasses at that time, people read by listening to others

History 100 Questions (65) Hehe, what should the ancients do if they are myopic? （2）

The problem of myopia in ancient China has also been known for a long time, but because glasses were not available at that time, people coped by listening to others read books or using other methods. Glasses also had a long development in China's history, but the original glasses were mainly reading glasses. During the Wanli period of the Ming Dynasty, the name of glasses was called "Dingding", and later, with the advancement of glasses manufacturing technology, glasses gradually became popular, and myopia lenses appeared. Before the absence of myopia lenses, TCM also had some ways to prevent and improve myopia.