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Currently, illness resides in the Yin aspect; when seasonal changes violate harmony and Qi is not smooth, Qi being unsmooth prevents Yang from ascending. Consequently, clear and turbid elements mix together. The emergence of internal and external symptoms is indeed due to other causes; discussing matters based on facts, one should not inquire about those "other" causes blindly.

This chapter specifically discusses how eyes are affected by harm or other diseases. The causes vary, and it is impossible to point directly to the most severe cause, so they are collectively termed "Yin Ta" (caused by others). For instance: Shanghan disease (Cold Damage), severe malaria with heat stagnation steaming and damaging the Tong Shen (pupil and intraocular tissues); Gu Zhang disease (abdominal distension like a drum) caused by excessive ingestion of Jiang (Zingiberis Rhizoma) and Fu Zi (Aconiti Lateralis Radix Praeparata) leading to eye swelling; Shi Yi (epidemic febrile diseases) snatching away Yuan Shen (vital spirit); Lan Zhang (visual obstruction like mist) interfering with Zheng Qi (healthy Qi); this is one category. Zhen Yin (True Yin/Kidney Yin) consumption and leakage lead to debility; Jing Jue (exhaustion of essence) causes dimness and blindness; Yang Qi hyperactivity due to mental fatigue leads to heat dominance causing confusion and delusion; this is another category. Jue Yun (syncope and vertigo) from Tan Zheng (phlegm disorders); Teng Se (pain and astringency) from Huo Zheng (fire disorders); Jie Yu (stagnation and depression) from Qi Zheng (Qi disorders); Chi Teng (redness and pain) from Xue Zheng (blood disorders); this is yet another category. In summary, whenever an illness affects the eyes, although there are external manifestations, one must ask what cause led to it, and treat according to that cause's symptoms. This approach is close to the Dao. One might simply select herbs from the Ben Jing (Classic of Materia Medica) to resolve the root cause. One must absolutely not be rigid and dogmatic, thereby failing the patient's condition. Alas! Heaven's endowment is fixed, but human self-destruction is endless. Thus, those who are deficient are many, while those who are abundant are few; those in prosperity are few, while those in adversity are many. If one knows to cherish oneself and avoid breaking rules, lives in simplicity and tranquility, waiting calmly for destiny, naturally disasters will be absent. If unexpected events occur, use wisdom to dispel obsession, reason to restrain emotions, and compare oneself with those less fortunate to comfort oneself. With a tolerant heart and no conflict with things, feeling that birds, beasts, fowl, and fish wish to approach, not only will the body remain healthy and vision clear, but longevity will also be achieved. Those with profound insight do not consider these words as empty talk; those cultivating truth and refining nature should take them as family precepts.

Few desires, distant worldly ties, mild temperament, suitable diet. Avoiding sun, moon, wind, and frost, one suffers from lingering, mute-like ailments that provoke deep thought.

This chapter discusses cases where the eyes fall ill without apparent cause. There are virtuous and benevolent people in the world who conceal their true nature and nurture simplicity, internally restraining human desires and externally aligning with Tian He (Heavenly Harmony). They should achieve Shui Huo Ji Ji (Water and Fire Interacting/Heart-Kidney Communication), with Yin and Yang each finding their proper place. Yet, their eyes still fall ill, and the illness persists. Why? It is likely due to deficient endowment. Even if one consumes rich foods daily, the body cannot transform them effectively at the right time. What should be generated fails to generate; what should not overcome does overcome. Examples include Que Mu (Night Blindness), Jin Shi (Myopia), Can Feng (residual wind-eye disease), Tian Xuan (vertigo sensation), as well as Chu Nu (virgins) with weak blood and Xiao Er (children) with Kidney deficiency. These are all determined by Zao Hua (Nature/Fate). Unless one is enlightened, applying common sense to judge these cases not only shows a lack of clarity in medical principles but also reveals premature lethal tendencies within the medicine cabinet. Therefore, beyond various causes, we add "Wu Yin Er Yin" (Causeless Cause). Experienced physicians (San Zhe Gong - those whose legs break three times, implying extensive experience) should regard my words as a guide.