目有五轮，禀于五行，原于五脏，轮取圆转层护，犹之周庐环卫，以奠皇居也。盖金之
精，
腾结而为气轮。木之精，腾结而为风轮。火之精，腾结而为血轮。土之精，腾结而为肉轮。
水之精，腾结而为水轮。气轮者，目之白睛是也，内应乎肺，西方庚辛申酉之金，肺主气，
故曰气轮。金为五行之至坚，故气轮亦坚于四轮，居外而为固也。风轮者，白睛内青睛是也
，内应乎肝，东方甲乙寅卯之木，肝木生风，故曰风轮。此轮青翠，内包膏汁，有涵养瞳神
之功，其色青，故目青莹者为顺也。血轮者，目大小 是也，内应乎心，南方丙丁巳午之
火，心主血，故曰血轮。有两心而无正轮，心君火也，通于大 ，命门为小心，小心相火也
，通于小 。火尚赤，故取红活者为顺也。肉轮者，目两胞是也。中央戊己辰戌丑未之土，
内应乎脾，故曰肉轮。夫土为五行之主，故四轮亦为脾所包涵。土主静，故目闭则静而不用
，此藏纳归静之用也。脾有两叶，摩化水谷，目有两胞，动静相应。其色尚黄，得血为润，
故目之两胞以黄泽为顺也。然四轮者，皆不能鉴物，惟逐层兜裹以保水轮。水轮者，内应乎
肾，北方壬癸亥子水也。肾属水，故曰水轮。中有黑莹一点，为能鉴万类，察秋毫，所谓瞳
神者也。五轮具而后为全目，目全而后为完人。治目者，可弗明辨之乎。
The eye possesses five wheels (Wulun, a theory classifying the eye into five zones corresponding to the Five Elements), derived from the Five Elements (Wuxing, Wood, Fire, Earth, Metal, Water) and originating in the Zang-Fu organs. The term "wheel" implies circular rotation and layered protection, akin to guards surrounding and protecting the imperial palace, thereby stabilizing the core.
The essence of Metal ascends and condenses to form the Qi Wheel (Qi Lun). The essence of Wood ascends and condenses to form the Wind Wheel (Feng Lun). The essence of Fire ascends and condenses to form the Blood Wheel (Xue Lun). The essence of Earth ascends and condenses to form the Flesh Wheel (Rou Lun). The essence of Water ascends and condenses to form the Water Wheel (Shui Lun).
The Qi Wheel refers to the white part of the eye (Baijing, sclera/conjunctiva), internally corresponding to the Lung (Fei). It aligns with the Metal element of the West (Geng, Xin, Shen, You). Since the Lung governs Qi, it is called the Qi Wheel. Metal is the most solid among the Five Elements; thus, the Qi Wheel is also the firmest among the five wheels, located externally to provide protection.
The Wind Wheel refers to the blue-green part inside the white of the eye (Qingjing, cornea/pupil area), internally corresponding to the Liver (Gan). It aligns with the Wood element of the East (Jia, Yi, Yin, Mao). The Liver-Wood generates wind, hence it is called the Wind Wheel. This wheel is verdant, containing internal fluid/gel, which functions to nourish and protect the pupil spirit (Tongshen). As its color is green, a clear and bright green appearance in the eye is considered a favorable sign (Shun).
The Blood Wheel refers to the inner and outer canthi (Da Zi and Xiao Zi), internally corresponding to the Heart (Xin). It aligns with the Fire element of the South (Bing, Ding, Si, Wu). Since the Heart governs Blood, it is called the Blood Wheel. There are two heart aspects but no central wheel: the Heart is the Minister Fire (Jun Huo), connecting to the outer canthus; the Mingmen (Gate of Life) represents the Minister Fire (Xiao Xin/Xiang Huo), connecting to the inner canthus. Fire corresponds to red; therefore, a ruddy and vibrant appearance is considered favorable.
The Flesh Wheel refers to the two eyelids (Baobao/Lid). It corresponds to the Earth element at the center (Wu, Ji, Chen, Xu, Chou, Wei) and internally corresponds to the Spleen (Pi), hence it is called the Flesh Wheel. Earth is the master of the Five Elements; thus, the other four wheels are encompassed by the Spleen. Earth is characterized by stillness; therefore, when the eyes are closed, they are still and inactive, serving the function of storage and tranquility. The Spleen has two lobes that grind and transform food and water; the eyes have two eyelids, responding in movement and stillness. Its preferred color is yellow; moistened by blood, a yellow and lustrous appearance of the eyelids is considered favorable.
However, these four wheels cannot perceive objects; they merely wrap around and protect the Water Wheel layer by layer. The Water Wheel internally corresponds to the Kidney (Shen), aligning with the Water element of the North (Ren, Gui, Hai, Zi). Since the Kidney belongs to Water, it is called the Water Wheel. In the center lies a black, crystal-clear point capable of distinguishing all things and perceiving the finest details; this is what is known as the Pupil Spirit (Tongshen). Only when the five wheels are complete is the eye whole; only when the eye is whole is the person complete. Those who treat eye diseases must not fail to distinguish these clearly.