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Once the disease is identified, medication must be administered; if the diagnosis is not accurate, a trial-and-error approach (Yan Yao Fa) should be employed. Suppose a patient has no change in the color of the pupil and no obvious nebula (corneal opacity), yet cannot see and desires to regain vision. How should this be managed? If tonifying agents for vision are used, they may inadvertently generate new opacities; if attempts are made to remove existing opacities, they cannot be physically ground away. It is necessary to first apply a mixture of auxiliary herbs (70%) and principal herbs (30%), instilling frequently for two to three days to bring the opacity to the surface, after which it can be removed. If no opacity exists, light-converging agents should be used. The emergence of even slight light perception indicates vitality. The patient should be instructed to maintain strict care, taking internal decoctions that clear heat and nourish Yin (Jiang Huo Yang Shui), while applying external drops that dissipate Qi and nourish vision (San Qi Yang Ming). Gradual improvement in vision signifies efficacy; aggressive treatment should be avoided. If within ten days there is no reversal of vision loss, it is considered a permanent disability (Fei Ji) and should not be forced. Alternatively, if opacities are diffusely spread, obscuring the distinction between black and white, causing visual shadows, and the patient seeks clarity: rushing to remove opacities will damage residual light energy; solely tonifying vision will fail to disperse the opacity. A mixture of principal herbs (60%) and auxiliary herbs (40%) should be applied frequently for five to six days. Only if the opacity remains unchanged but light perception slightly improves should heavy doses be administered. If light does not improve and the opacity only thins slightly, what is the utility of the medication? For any unrecognized or undiagnosed conditions, one must not lightly deceive or fabricate diagnoses, thereby harming patients. Employing tentative testing methods—proceeding when feasible and stopping when not—is the essence of benevolent guidance; one must not refuse treatment to patients.

Currently, when instilling eye medications, practitioners rely heavily on Da [Zhu] (likely referring to a specific base or herb, contextually implied as a primary vehicle), regardless of the syndrome, applying it directly to the affected area. They fail to realize that Da [Zhu] can only treat fleshy growths (Rou) and cannot eliminate other pathologies. Instead, one should lift the upper eyelid, sprinkle the medication inside, keep the eyes tightly closed for an extended period, allowing the medication to diffuse evenly everywhere. This ensures no gap between the lens (Jing Zhu) and the eyelid. Regarding the grinding of opacities, medication must be applied adjacent to the opacity, moving up and down with its position, to effectively remove it. Scattered application renders the medication ineffective.

Shi (Realgar), Dan (Cinnabar), and Lu (Arsenic compounds) are toxic if unprocessed; Piao Xiao (Mantis Egg Case) and Ci Shi (Magnetite) are difficult to grind if unprocessed. Thorough fine grinding is essential. After careful selection, materials may be calcined by fire, levigated by water, or soaked in medicinal juices. Those requiring calcination must be processed until soft (Su), then added to the juice, dried, and re-added. For fire calcination, place the material on a tile, cover with charcoal fire, and fan vigorously. The heat intensity must not be excessive nor insufficient. For water levigation, grind finely, add to water, stir and settle several times. Pour off the suspended upper layer into a separate vessel, decant the clear water, dry, and grind again. Other herbal materials merely require boiling, soaking, and washing.