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Ascending the high platform of "Qingleng" (Clear and Cold), looking back while halfway up the stairs, crawling forward on hands and knees, one will experience dizziness and confusion. If one closes or opens eyes alone, calms the mind and regulates the qi, yet the sensation persists for a long time; or if one gazes into the distance alone causing vertigo, sits kneeling with disheveled hair for a long time, and looks down at the ground without relief even after a long period, why does this sudden vertigo arise from the height? (The air at the top of the high platform is cold, hence it is called the "Platform of Clear and Cold." When ordinary people climb high to gaze afar, seeing extraordinary sights, their soul and spirit are invariably startled and agitated, leading to mental dizziness and confusion.)

The essence of the Five Zang and Six Fu organs all ascends to the eyes to form the brilliance of vision. (To form the brilliance refers to the function of acute visual perception.) The cavity of the eye is called the "Ke" (nest/cavity). (The "Ke" refers to the hollow. The eye is the general term for the organ of sight; since the essence of the Five Zang and Six Fu organs all ascends to the eyes, the eye serves as the nest of essence, manifesting the five colors.) The essence of bone manifests in the pupil. (The pupil is the black part of the eye. The essence of bone is governed by the Kidney; the Kidney belongs to Water, its color is black, thus the pupil is bright inside and correctly black.) The essence of sinew manifests in the dark part of the eye (iris). (The dark part refers to the area surrounding the pupil. The essence of sinew is governed by the Liver; the Liver's color is green, thus its color is lighter than that of the pupil.) The essence of blood manifests in the collateral vessels. (Collaterals refer to the blood vessel network. The essence of blood is governed by the Heart; the Heart's color is red, thus the color of the collaterals is red.) The essence of Qi within the orbital cavity manifests in the white part of the eye (sclera). ("Qi of the Ke" refers to the Qi of the muscles around the eye socket. The essence of Qi is governed by the Lung; the Lung belongs to Metal, thus it manifests as the white part of the eye.) The essence of muscle manifests in the eyelids (Yueshu/Constraints). (Yueshu refers to the eyelids, which can open and close, formed by the essence of muscle and governed by the Spleen. The Spleen belongs to Earth, responsible for storing and containing; thus it gathers the essence of bone, sinew, blood, and Qi from the four other organs, combining them into the Optic Nerve System (Muxi), ascending to connect with the brain and emerging between the neck and head.)

Therefore, if pathogenic factors invade the neck, coinciding with a deficiency in the body's righteous Qi, and the invasion is deep, they will follow the optic nerve system into the brain. Once entering the brain, it causes the brain to rotate; brain rotation pulls the optic nerve system tight; tension in the optic nerve system leads to visual vertigo and spinning. Pathogenic factors disrupt the essence; when the essence is invaded by pathogens and fails to coordinate, the essence scatters. Scattered essence results in diplopia (seeing double images). (The first "Xie" [pathogen] refers to pathogenic factors; the second "Xie" is synonymous with "Xie" [oblique/slanted]. Pathogenic factors strike between Fengfu (GV16) and Tianzhu (BL10); taking advantage of deficiency, they enter the brain and connect to the eyes. Tension in the optic nerve system causes vertigo and slanting of essence, resulting in alternating slackness and tension in the left and right meridians. Diplopia deviates from normalcy, meaning the objects seen by both eyes do not correspond similarly but appear different, hence one object is seen as two. This illustrates how pathogenic factors harm humans, clarifying that the "seeing extraordinary sights" mentioned below also belongs to the category of external pathogenic factors.)

The eyes are the gathering place of the essence of the Five Zang and Six Fu organs, the place where Ying-Wei (Defensive and Nutritive) Qi, Hun, and Po are constantly nourished, and the source of Shen-Qi (Spiritual Qi). (Wherever Zang-Fu, Ying-Wei, Hun, and Po reach, there is Shen-Qi; thus, the eyes are the source of Shen-Qi.) Therefore, excessive labor of the spirit causes Hun and Po to scatter and will/intent to become chaotic. Thus, the pupils and dark parts of the eyes conform to Yin, while the whites and red vessels conform to Yang; the transmission and combination of Yin and Yang maintain clarity and brightness. (Yin and Yang are the root of spirit; thus, their combination forms the function of clear vision.) The eyes are the envoys of the Heart, and the Heart is the residence of the Spirit. Therefore, if spiritual essence becomes chaotic and does not return, and one suddenly sees extraordinary sights, the spirit, essence, Hun, and Po scatter and fail to harmonize; this is called "Huo" (Confusion/Dizziness). (Although spirit is unified by the Heart, its external manifestation lies in the eyes; thus, the eyes are the envoys of the Heart, and the Heart is the residence of the Spirit; therefore, seeing abnormalities externally causes the soul and spirit to become dizzy and confused internally.) If the Heart has preferences and the Spirit has aversions, and these suddenly interact, the essence and Qi will also become chaotic. Due to erroneous vision, one feels confused; once the spirit shifts away, recovery occurs. (What the Heart likes, if suddenly met with strange phenomena, the Spirit may dislike. Since the Spirit dislikes, the will cannot follow; the interaction of like and dislike in an instant causes essence and Qi to become chaotic; leaving the situation allows the spirit to shift, and upon shifting, recovery ensues.) Therefore, mild cases are called "Mi" (Lost/Confused), and severe cases are called "Huo" (Dizzy/Perplexed). ("Jian zhe" refers to mild conditions; even mild cases cause confusion, let alone severe ones, which inevitably lead to perplexity.)