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.
Except for which of the following, can all explain the above phenomenon?
In ancient times, transportation was underdeveloped, and travel mainly depended on walking and horseback riding. Adequate exercise played a certain role in preventing myopia