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The disease known as "Zhang" (opacity) is also named Ni Shun (Reverse and Smooth). Its progression encircles from the upper and lower aspects. In a fleeting moment, it may damage the Wind Wheel (cornea), leading to the emaciation and deterioration of the Tong Shen (pupil and internal ocular structures).

How should it be treated? One must calm the Liver and nourish Kidney Water. If treatment yields no merit, one must adhere to the profound principle of consolidating Metal (Lung) and using Ginseng.

This condition manifests as an opacity growing on the upper and lower parts of the Wind Wheel. The opacity varies in thickness, shape (round or elongated), and color (dull white). It is surrounded by red vessels that wrap around and cover it, causing blurred vision and excessive tearing. The etiology involves deficiency, wind-dampness, and phlegm stagnating in the meridians. Stagnation in Yin causes onset in the left eye first; stagnation in Yang causes onset in the right eye first; if both Yin and Yang are stagnant, both eyes erupt simultaneously. The eyelids are not red or swollen, and the eyeball lacks distending pain, yet this should not be taken lightly. If the eye is damaged and the Shen Gao (vitreous humor/ocular essence) is ruined, accompanied by headache like being struck by a club and inability to distinguish objects, it becomes impossible to predict what other disease it might transform into.

The contour of the eye is naturally formed with five colors. When these five colors are distinct, one guards the Black (pupil) and knows the White (sclera). However, when Black and White fail to maintain their virtue (normal state), Black turns Yellow and White turns Red. When Black and White are indistinguishable, it is named Hun Yi (Mixed Clarity/Mixing Eye Opacity). If the contour remains undamaged, nine out of ten cases can be cured. But if the disease persists for years and medication is inaccurate, even Night-Luminous Pills (Yeguang Wan) will not be effective, nor will Lingbi Stone suffice.

This condition consists entirely of a single-color dull-white opacity, without damage to the ocular contour. Upon close inspection, the pupil is still visible. It persists unchanged over a long period; without treatment, it neither heals nor worsens. This is the most common ocular disease among patients in the world. Symptoms such as redness, pain, photophobia, discharge accumulation, and tearing are identical to other diseases. The progression and treatment methods are also similar. Occasionally, there are cases where the opacity is dense and solid, resembling salt-crisped black beans, with coarse, thread-like entanglements, looking like broken porcelain buttons. Achieving efficacy is extremely difficult.

Superficial individuals do not know when to advance or retreat. They use no medicinal decoctions, relying solely on herbs or alchemical pills, applying them externally and instilling them internally. When ineffective, they resort to rubbing with hands, licking with tongues, picking ear roots, and moxing arm pits, going to any extreme. This is not only useless but harmful. Or, if the disease is mild and would heal spontaneously, a mediocre doctor happens to treat it successfully at that moment. Without self-reflection, he boasts of citing precedents, which is the height of incompetence. Even more absurd are those who prescribe wearing peach wood charms, gazing into water bowls, or tying corners of clothes—practices truly worthy of laughter.

I inherited my master's teachings and have studied and compared various texts for many years, grasping the principles of each condition. Although my treatments may not be miraculous, they are certainly error-free. Apart from surgical needle techniques, the medications I use generally include those that relieve depression/stagnation, resolve phlegm, regulate Qi, promote blood circulation, nourish Yin, support Yang, dispel wind, and descend fire. Furthermore, physicians travel far with their skills; unless it is a terminal case, they do not easily accept patients. Once the disease has become terminal, prescriptions mostly focus on tonification and harmonization. Therefore, patients often suspect that because the medicine is not from a specialist, it is inferior. They do not realize that precisely because it is not restricted to a specialist's narrow scope, it utilizes methods that specialists cannot apply. Just as Ni Zan (Ni Yu) in his later years painted bamboo under lamplight, feeling proud and content. In the morning, upon unrolling the painting, it looked nothing like bamboo. Ni Zan laughed and said, "The places where it looks nothing like bamboo are exactly where others find it hard to reach." This serves as a good excuse for self-mockery.