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The theories of the Five Wheels and Eight Palaces have been discussed in detail; these pertain to the physical structure of the eye, but do not yet address its functional use. As for the spiritual clarity that operates silently, reflects all things, and perceives even the finest hairs, this resides in the Pupil Spirit (Tongshen). Hua Yuanhua stated: "The shape of the eye resembles a sphere; the pupil spirit is centered and protrudes forward, just as the sun and moon shine brightly in the southeast while the northwest appears dim." The eye possesses Divine Paste (Shengao), Divine Water (Shengshui), Divine Light (Shenguang), True Blood (Zhenxue), True Qi (Zhenqi), and True Essence (Zhenjing); all of these are fluids that nourish the source of the eye.

Divine Paste refers to the paste-like fluid contained within the eye. This paste is formed by the accumulation of essence juice seeping from the Gallbladder (Dan), thus it can nourish the Pupil Spirit; if it declines, damage occurs. Divine Water originates from the Triple Burner (Sanjiao) and is transformed from the primordial True One Qi of innate constitution; it is the moistening water within the eye. If water declines, fire may prevail, leading to dryness and bursting afflictions. If water is exhausted, diseases of abnormal eye size arise; if consumed and stagnant, there is a risk of dimness; since deficiency is common and fullness is rare, no eye in the world is perfectly pure.

Divine Light originates from the Gate of Life (Mingmen), connects with the Gallbladder, issues from the Heart (Xin), and represents the function of Fire. If fire declines, there is a risk of dimness; if fire flares up, there is a disaster of burning; therefore, decline requires tonification, and flare-up requires descending. The Heart Monarch is the master and connects with the major collaterals; redness in the major collaterals indicates Excess Fire. The Gate of Life is called the 'Small Heart' and represents Ministerial Fire (Xianghuo), which acts on behalf of the ruler and connects with the minor collaterals; redness in the minor collaterals indicates Deficiency Fire. If the Monarch remains still and silent, Ministerial Fire naturally becomes clear and tranquil.

True Blood is the blood rising and transporting from the Liver (Gan) to nourish the eye's collaterals; this blood differs from the blood circulating among muscles and is generated by the Water of Tianyi, hence it is called 'True'. True Qi is the vital energy moving within the eye's meridians to generate function, originating from the primal Yang of the innate True One. True Essence is the essence juice transformed from innate primordial Qi, starting from the Kidney (Shen), applied to the Gallbladder, and finally reaching the Pupil Spirit. If any of these are damaged, the eye becomes difficult to treat.

Generally, the eye is round and elongated, surrounded by several layers of hard shell externally, with the Qing Bao (Green Capsule) in the middle, containing a box of black, thick Divine Paste internally. Outside the paste is white, thick Divine Water, which nourishes the paste. Outside the water is all blood, which nourishes the water. A single point of black brilliance within the paste is the essence gathered by the Kidney and Gallbladder. Only this point allows for infinite illumination and observation; it is the supreme treasure of the human body and the spiritual light of heaven and earth.

Someone asked: Is the Pupil Spirit water? Qi? Blood? Paste? I replied: No. It is neither water, nor Qi, nor blood, nor paste. It is generated by innate Qi and completed by acquired Qi, containing the subtleties of Yin and Yang, and the essence of Water and Fire. Blood nourishes water, water nourishes paste, paste nourishes the Pupil Spirit, Qi manages operation, and Spirit maintains it. Using the sun and moon as metaphors, this principle is inherent. Moreover, the pupil is smaller before noon and larger after noon, also following the operation of Yin and Yang.

Broadly speaking, the eye opens through the Liver, originates from the Kidney, functions through the Heart, operates via the Lung (Fei), and stores in the Spleen (Pi). Its size and shape vary due to different constitutions. In men, the right eye lacks the essence of the left; in women, the left eye lacks the radiance of the right; this is because each obtains the correct aspect of Yin or Yang Qi.

Mr. Xie Dongtian from Yunjian, who was proficient in medical principles, once told me: "Treating eye diseases takes the Pupil Spirit as the root. If the Pupil Spirit is undamaged, even if nebulae cover the eye, they will easily recede in time. If the Pupil Spirit is damaged, even extreme rescue efforts are futile. Therefore, I wrote this treatise to clarify its critical importance, so it should not be regarded as ordinary." At that time, we studied each other's insights and benefited greatly. Now Mr. Dongtian has passed away, and I am in my twilight years. Writing this to recall him, I feel the sorrow of a cold bird longing for its flock.