1, kidney essence is sufficient, the eyesight is clear human essence is the basic substance of life activities. Suwen – pulse to the essence of the theory of “said”: “the essence of the person, so see all things, to distinguish between black and white, to examine the length; to long for short, white for black, such as the essence of the decline.” It means that the eye’s ability to see depends on sufficient essence nourishment. The Suwen Shanggu Tianzhen said: “The kidney is the main water, by the five viscera and six bowels of the essence and hide it.” Therefore, whether the eye’s vision is normal, and the kidney by the collection of the internal organs of the essence of the adequacy of the relationship is very close. 2, the kidney produces brain marrow, the eye system belongs to the brain “Nei Jing” says: “kidney produces bone marrow, the brain is the sea of marrow, the eye system belongs to the brain.” Brain and marrow is synonymous with the same, both by the kidney’s hidden essence, the eye system even belong to the brain, also related to the kidney. Therefore, the kidney essence is abundant, the sea of marrow is full, it is flexible thinking, sharp eyes. If the kidney essence is deficient and the medulla is insufficient, the brain will turn to tinnitus and the eyes will see nothing. The “Medical Lin Correction – Brain Marrow” is said: “The essence of the clear juice, transformed into marrow, from the spinal cord upward, such as the brain, called the brain marrow. The two eyes are born of the brain juice, the two eyes are tied like a line, long in the brain, the things seen to the brain.” It can be seen that Wang has clearly attributed the vision of the eye to the brain born of kidney essence, and also clarified the relationship between the eye and the brain through the kidney. 3. The kidney is the master of fluids, and it moistens the eye pearls. “The kidney is a water organ, master of fluids,” says Su Wen (Su Wen). The chapter of “Spiritual pivot – five retention of fluids” also says: “The fluids of the five viscera and six internal organs, all seep up to the eyes.” If the fluids in the eyes turn into tears, it is the water that moistens the outside of the eyes; turn into Shen Shui, it is the fluid that fills the eyes. In short, the distribution and regulation of water inside and outside the eye, and the function of the kidney main water has a close relationship. 4, the relationship between the eye and the bladder The kidney and bladder combined with the internal organs, each other. In the process of water metabolism in the human body, the bladder mainly has the function of storing fluid, transforming gas and water, excretion of urine. The bladder’s qi-transforming effect depends mainly on the strength and weakness of kidney qi. In addition, the bladder belongs to the foot sun meridian, the main surface of the body is vulnerable to external evil, and often causes eye disease, so we must not ignore the importance.