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The eyes are the gathering place of the essence and brilliance of the five zang organs and six fu organs, the aggregation point of the Zong Mai (major meridians), and the external manifestation of the Liver. The Liver stores blood; if the qi and blood of the zang and fu organs are harmonious, the eyes will be vibrant and clear. However, if wind-heat, phlegm, or fluid retention infiltrates the zang and fu organs, causing the liver's qi and blood to stagnate and accumulate, this pathogenic factor may surge into the eyes. This leads to changes in body fluids that form accumulations, resembling a "pearl tube" (abnormal protrusion or morphology of the eyeball).

The eyes represent the gathering of the yin-yang essence of the zang and fu organs, the aggregation of the Zong Mai, the pathway for ascending fluids, and the external manifestation of the Liver. In ordinary individuals, if wind-heat, phlegm, or fluid retention infiltrates the zang and fu organs, disrupting yin-yang harmony, liver qi may stagnate and generate heat. This heat surges upward into the eyes, causing pain in the eyeballs. If the hot qi impacts the eyeball ("the pearl"), it may cause the eyeball to protrude or dislocate.

In cases where vision cannot focus on distant objects, it is because the eyes serve as the external manifestation of the Liver and the repository of organ essence. If physical exertion damages the zang and fu organs, leading to insufficient liver qi, and this is compounded by wind-pathogen invasion, the essence qi becomes weak, resulting in an inability to see clearly at a distance.

The eyes are the external manifestation of the Liver, the gathering of zang-fu essence, the aggregation of the Zong Mai, and the pathway for ascending fluids. If sorrow moves internally within the zang and fu organs, the fluid pathway opens, causing tears to flow. If the tear fluid is exhausted, the eyes become dry. Furthermore, if wind-pathogens invade the zang and fu organs externally and transmit to the fluid pathway, it also causes tearing accompanied by frequent yawning. Once the tears are exhausted, the eyes become dry. If labor-induced heat affects the zang organs, and hot qi attacks the Liver and surges into the eyes, the eyes will feel hot and dry; in severe cases, redness and pain occur.

The eyes are the gathering place of the essence of the five zang and six fu organs and the aggregation of the Zong Mai. The essences of sinews, bones, blood, and qi, combined with the vessels, form the Eye System (optic nerve and associated tissues connecting the eye to the brain), which extends upward to connect with the brain. If the zang and fu organs are deficient, wind-pathogens may enter the brain through the Eye System due to this deficiency. This causes the brain to turn and the Eye System to tighten, resulting in blurred vision and vertigo (dizziness).

The eyes are the gathering place of the essence of the five zang and six fu organs. When an individual suffers from insufficiency of the zang and fu organs, the essence becomes deficient, allowing evil qi to invade. Consequently, the essence scatters, causing diplopia (seeing one object as two).

The eyes are the gathering place of the essence of the five zang and six fu organs. When the zang and fu organs are deficient, wind-pathogens enter the eyes. If the pupil is struck by wind, the alignment of the visual axis becomes incorrect, resulting in strabismus (deviation of the eye). This condition may be congenital or acquired later in life, but it is always caused by the deficiency of the eye's essential qi and subsequent invasion by wind-pathogens.