认得其病，必当用药，如认不真，必当用术。设有瞳色不变，障翳全无，但只不见，欲见光明者，何以处
之。欲与养明，反生翳障，欲与去翳，又不可磨。必须先用辅药七分，主药三分，勤点两三日，发出翳来，就
与去之。如其无翳，当与敛光，觉得少有光明，便是生意。令病患慎守，内服降火养水之剂，外点散气养明之
药，渐渐光明，乃是效处，不宜急速攻之。如旬日之内，光不得转，此为废疾，不可强之。或有障翳漫布，黑
白不分，睹物有影，欲求分明者，何以治之。急于去翳，必损余光，一于养明，翳不得敷，必须先用主药六分，
辅药四分，勤点五六日，翳不动而光略生，方施重剂。光不生而翳略薄，施药何用。凡有不识之病，不可轻诳
轻诈，以致误人。少行演试之术，可行则行，可止则止，此乃善诱之意，不可拒绝人也。
今人点药于眼，皆以大 为根，不拘何证，皆点是处。殊不知大 但 肉可治，余不能除，不若揭起上弦睑，
以药播入，紧闭良久，使药周遭散漫，无处不到。睛珠睑 ，药无所间。至于磨翳，必傍翳点药，随其上下，
方得翳去。不可间散施点，使药不验。
砂、丹、芦，不制有毒，螵蛸、磁石，不制难研，务须研细。拣择停当，或火炼，或水飞，或投入药汁者，
必炼 令苏入汁，候干再入。如火炼者，必用瓦放药在上，以炭火罩漏旺扇者，火候不可太过，不可不及。如
水飞者，必须研细，放入水中，搅沉数次，将上浮起者，另倾别器，澄出清水，晒干再研。其余草药，不过煮
浸净洗而已。
认清了病症，就必须用药；如果诊断不确切，就应当采用试探性的治疗方法。假设有患者瞳神颜色没有改变，也没有明显的翳障，只是看不见东西，想要恢复视力，这种情况该如何处理？如果用补益明目的药物，反而可能产生新的翳障；如果想去除翳障，又无法通过研磨的方式直接去掉。必须先用辅药七分、主药三分的比例，频繁点眼两三天，促使翳障显现出来，然后再将其去除。如果并没有翳障，则应当使用收敛光气的药物，感觉到患者眼中稍有一点光亮，就说明有了生机。嘱咐患者谨慎调护，内服降火滋阴的药剂，外点散气养明的药物，使视力逐渐恢复，这才是有效的治疗，不宜急于求成地强力攻伐。如果在十天之内，视力没有好转，这属于废疾（不可治愈的眼病），不可强行治疗。或者有翳障弥漫分布，黑白不分，看物体有阴影，想要看得清楚，该如何治疗？急于去除翳障，必然会损伤残余的光气；一味地补益明目，翳障却无法消散。必须先用主药六分、辅药四分的比例，频繁点眼五六天，如果翳障未动而光气略生，才施用重剂。如果光气不生而翳障略薄，施药又有何用？凡是遇到不认识或诊断不明的病症，不可轻易欺骗或妄下结论，以致误人。少用一些试探性的方法，可行的就做，不可行的就停止，这是善于引导患者的用意，不可拒绝为患者治疗。
现在人们给眼睛点药，都以大 为根本，不管什么病症，都在患处点药。殊不知大 只能治疗肉，其他病症不能消除，不如掀起上眼睑，将药物播入，紧闭眼睛很久，使药物在周围扩散，无处不到。睛珠与眼睑之间，药物无间隔。至于磨除翳障，必须在翳障旁边点药，随着翳障的位置上下移动，才能去除翳障。不可分散地点药，使药物无效。
砂、丹、芦，不经过炮制就有毒，螵蛸、磁石，不经过炮制难以研磨，务必研磨细腻。挑选妥当，有的用火炼，有的用水飞，有的投入药汁中，必须炼至软化后加入药汁，等干了再放入。如火炼的，必须用瓦片放药在上面，用炭火罩住，旺盛扇风，火候不可太过，也不可不及。如水飞的，必须研磨细腻，放入水中，搅拌沉淀数次，将上浮起的另倒进别的容器，澄清出清水，晒干后再研。其余草药，不过是煮浸洗净而已。
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.