What exactly is Dendrobium? According to the legend, more than a thousand years ago, there was a magician named Xu Fu beside Qin Shi Huang. One day, Xu Fu had a dream that there was an immortal mountain in the vast and misty sea. He heard the sound of laughter in the distance, and in a short time, two white feathers floated in the air, falling gently like a breeze, and transformed into two fairies wearing white neon dresses, who smilingly said to the flower, “I beg the fairy of purple carpets to give a life-saving elixir. After taking off a silver pin from her hair, she gently plucked a jade dew into a thumb-thin jade ring, and then said together, “Thank you, Purple Carpets”. Then they turned into feathers and drifted away with the wind. Xu Fu looked dumbfounded, dumbfounded to stretch out his hand to touch the strange tree, suddenly lightning and thunder, the wind, a dragon descended from the sky, opened its bloody mouth to angrily rebuke Xu Fu: “bold fanatics, this is the world’s first Yin to the purest of the treasures, eat it can be revived, immortality, is not a blessing to those who can enjoy it?” After saying this, he made a devouring gesture. Xu Fu was immediately scared out of his mind, turned around and ran wildly, lost his footing and fell into the abyss, woke up suddenly. One day, he finally found the courage to tell Qin Shi Huang about his dream, saying that he was willing to go to the immortal mountain in his dream to seek immortal herbs for the emperor. Since the reign of Emperor Qin Shi Huang, he was afraid that the foundation of a thousand generations would fall into the hands of others if he went west one day, so he recruited the world to search for the medicine of immortality. Now, he was surprised to learn of Xu Fu’s proposal and immediately ordered Xu Fu to bring 3,000 boys and girls across the East China Sea to seek the medicine of immortality. But the sea was so vast that Xu Fu’s group of people ended up in vain and were stranded on the island of East Japan. The legend says that the 3,000 boys and girls who went with them became the ancestors of Japan today. The “purple carpets of immortal beauty” seen in Xu Fu’s dream is the ultimate nourishment of yin in the future – dendrobium, of which “purple carpets” is “nourishment of yin The “purple pillar” means “nourishing Yin”. Dendrobium has been known as “life-saving herb”, “nine Chinese immortal herbs” and “gold in medicine” since ancient times. In Shennong Ben Cao Jing, it is highly praised for its efficacy of “main injury, removing paralysis, lowering qi, and nourishing the deficiency of five organs and consumption”. In addition, it is also a very good eye care product. According to Chinese medicine, the essence of the five viscera and six bowels of the human body is injected into the eyes through the blood vessels, of which the liver is the main organ that opens the eyes, and the physiology of the eyes is closely related to the abundance of liver essence. If the essence of the liver is abundant, the eyes will be bright and shining, flexible, bright and energetic; if the essence is insufficient, the eyes will be dull and dull, or both eyes will be dry, or the vision will be dull and dull, or night blindness, etc. Dendrobium has a strong function of nourishing Yin and nourishing liver, so it has been used as a good product for eye care by medical doctors for many generations. The Song Dynasty “Shengji General Record” has recorded “Dendrobium San”, whose function is to treat “the eyes see brightly in the daytime but dimly in the evening, and cannot see anything, called bird’s eye”. Dendrobium Luminosum Pill, which is commonly used in modern ophthalmology clinic, has the effect of nourishing the kidney, pacifying the liver and brightening the eyes, and is used for the treatment of dimness and unclearness of vision and night blindness caused by the deficiency of liver and kidney yin, especially for the improvement of vision of patients with cataract, glaucoma and other optic neuropathy. Nowadays, the thousand-year immortal herb Dendrobium ferruginum has gradually entered the life of millions of ordinary people, and Dendrobium ferruginum is called one of the common drugs in Chinese medicine rooms. Friends with cataract, glaucoma, optic nerve atrophy can try decoction of Dendrobium iron skin to drink as tea, which can nourish the yin and kidney, and also have the effect of brightening the eyes, which is a good way to health care and prolong the life.