As cultural knowledge becomes more and more important, people spend more and more time on reading, and the proportion of literati students with myopia is getting higher and higher. Even among urban workers and township farmers, many people can be seen wearing myopic glasses. However, few scholars with myopia, let alone ordinary people, were found in ancient China.
The statement "The ancients lived at a slow pace and did not have to worry about traffic safety, so even if they suffered from myopia, the harm was very small" cannot explain the above phenomenon.