Qingfeng: refers to spring wind. In Chinese medicine, this refers to bluish glaucoma, characterized by a light pain in the head and eyes, a small decrease in vision, and light green in the pupils.

1. The Yellow Emperor asks Shao Yu, "If a group of people who are the same age and wear the same clothes, walk together and meet a sudden heavy wind and rainstorm"
2. Some get sick, some do not.
3. Sometimes all the people fall ill and sometime none do. What's the reason?
4. Shao Yu says, "In spring the breeze is in season. In summer the warm wind is in season. In winter the cold wind is in season. In autumn the cool wind is in season. Wind in the four seasons influences the human body and leads to different diseases for different people under different conditions."
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