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The five Zang organs of the human body are like the Five Sacred Mountains (Wuyue) of heaven and earth; the six Fu organs are like the Four Great Rivers (Sidu) of heaven and earth; the Eight Extraordinary Vessels (Qijing) are like rivers and streams beyond the Four Great Rivers. When pathogenic factors invade the extraordinary vessels, they cannot be treated by the methods used for the twelve regular meridians. There are specific methods for treating the extraordinary vessels outside of those for the twelve regular meridians. The *Suwen: Mi Ci Lun* states: "When pathogenic factors invade the Foot Yang Qiao Mai, it causes eye pain starting from the inner canthus." Wang Bing's commentary on the *Huangdi Neijing Taisu* explains: "Because this meridian originates at the foot, ascends to the head, and connects to the inner canthus, disease manifests as eye pain starting from the inner canthus." The *Lingshu: Zhen Jing* states: "The Yin Qiao Mai enters the nasal cavity, connects to the inner canthus, and merges with the Taiyang and Yang Qiao meridians to ascend." Therefore, when the Yang Qiao Mai is invaded by pathogens, the inner canthus becomes red, thread-like blood vessels appear, rooted in fleshy growths (Pterygium); these growths produce yellow-red membranes that horizontally invade the cornea, gradually eroding the Shen Shui (aqueous humor). This is the sequence of pathology in the Yang Qiao Mai. If accompanied by pathology in the outer canthus (Rui Kou), it is because it merges with the Hand-Taiyang Small Intestine meridian. Diseases of the outer canthus are necessarily milder than those of the inner canthus, as lateral transmission involves fewer pathways, while the primary affected site bears more burden. Commonly called Pterygium (Pan Jing), this condition is treated primarily with Huan Yin Jiu Ku Tang, Bo Yun Tui Yi Wan, Zhizi Sheng Qi San, Wan Ying Chan Hua San, Mo Zhang Ling Guang Gao, Xiao Yi Fu Ming Gao, and Piao Xiao Huang Lian Lu Gan Shi Pao San. For severe cases where medication cannot reach the lesion, manual therapy is appropriate. First, wash with cold water. Using a technique similar to cataract needle extraction, hold firmly with the left hand to prevent movement, then use the tip of a small eyebrow knife to excise the fleshy growths. Wash again with cold water, then continue administering the aforementioned herbal medicines. This is the method for treating pathogenic invasion of the extraordinary vessels. Thus, the origin of diseases related to these meridians is recorded here.

Those who strive for solidity allow the Eight Winds no opportunity to exploit their gaps; those who maintain strict integrity leave no room for pathogens to invade the Zang organs. Life is granted by Heaven, but illness is summoned by human actions. Even if one is born healthy, without summoning disease, no harm can come. If harm persists, it is due to excessive self-invocation. The *Suwen: Sheng Qi Tong Tian Lun* states: "Wind is the beginning of all diseases." When one maintains purity and tranquility, the muscle pores and interstices close and repel pathogens; even severe winds and toxic agents cannot cause harm. The *Suwen: Yin Yang Ying Xiang Da Lun* states: "Pathogenic winds arrive swiftly like wind and rain; therefore, skilled healers treat at the level of the skin and hair." If the muscle pores are solid and the skin and hair dense, from where would harm originate? Now, if injured by external objects, the gaps between the skin, hair, and muscle interstices become significant. At the time of injury, internal shifts of the Seven Emotions likely occur, becoming the root of Wei Qi (Defensive Qi) depletion. Both factors invite pathogens, so how could Wind not enter? Consequently, injuries to the upper, lower, left, or right aspects of the eye result in corresponding pathological changes in those areas, treated generally with Chu Feng Yi Sun Tang. Injuries to the brow bone cause disease originating from the Eye System (Mu Xi) downward, due to gaps in the Hand-Shaoyin Heart meridian; add Huang Lian (Coptidis Rhizoma) and treat with Chu Feng Yi Sun Tang. Injuries to the forehead cause disease ascending from Di Guo; injuries to the ear canal cause disease entering from the outer canthus, due to gaps in the Hand-Taiyang Small Intestine meridian; add Chai Hu (Bupleuri Radix) and treat with Chu Feng Yi Sun Tang. Injuries to the forehead vertex, ear apex, and brain cause disease emerging from the inner canthus, due to gaps in the Foot-Taiyang Bladder meridian; add Cang Zhu (Atractylodis Rhizoma) and treat with Chu Feng Yi Sun Tang. Injuries to the area behind the ear, ear apex, and front of the ear cause disease descending obliquely from Ke Zhu Ren (ST7); injuries to the cheek cause disease entering from the outer canthus, due to gaps in the Hand-Shaoyang Sanjiao meridian; add Zhi Ke (Aurantii Fructus) and treat with Chu Feng Yi Sun Tang. Injuries to the temple, front and back of the ear, and behind the outer canthus cause disease entering from the outer canthus, due to gaps in the Foot-Shaoyang Gallbladder meridian; add Long Dan Cao (Gentianae Radix) and treat with Chu Feng Yi Sun Tang. Injuries to the forehead corner and vertex cause disease descending from the Eye System, due to gaps in the Foot-Jueyin Liver meridian; add Wu Wei Zi (Schisandrae Fructus) and treat with Chu Feng Yi Sun Tang. For all cases with Heat symptoms, additionally add Huang Qin (Scutellariae Radix) and concurrently administer Jia Di Huang Wan. For severe injuries, temporarily increase the dosage of Da Huang (Rhei Radix et Rhizoma) to purge stagnant blood. The *Suwen: Liu Jie Zang Xiang Lun* states: "The Liver receives blood and thereby enables vision." These herbs nourish, tonify, and restore blood, addressing the root cause. Additionally, sudden trauma may cause the Shen Shui (aqueous humor) to scatter irreparably; such cases are noted here for reference.