因风者。谓患风人病目也。风在五行为木。在脏为肝在窍为目。本乎一气。故患风人。未有
目不病者。然必因其故而发。有日浅而郁未深。为偏 歪斜者。有入脾而睥反湿胜赤烂者。有血
虚筋弱而振搐者。有不禁而反伤精神。及恣燥嗜热。蕴郁而为内障者。有风盛血滞。结为外障。
如肉等证者。各因其证而伐其本。内外治法不同。大抵风病目者。当去风为先。风不去。目病
终无不发之理。
因毒者谓人生疮疡肿毒累及目病也。若病目在病毒之时。治毒愈而目亦愈。若毒愈而目不愈
者。乃邪入至高之深处。难以自退。当浚其本。澄其源。因而触激甚者。有瘀滞之变。
因他证而害及目。所致不同。如伤寒阳证热郁。蒸损瞳神。内证也。热盛血滞。赤痛泪涩者。
外证也。阴证脱阳目盲。内证也。服姜、附温热之剂多而火燥赤涩者。外证也。疟疾之热损瞳神。
内证也。火滞于血而赤涩。外证也。泻利后昏眇。为谷气乏。气伤不能发生。内证也。山岚瘴气
目昏者。邪气蒙蔽正气。外证也。蛊胀中满赤痛者。阴虚难制阳邪。内证
也。气证多郁。弱证多昏花。皆内证也。痰证之腻沫。火证之赤涩。皆外证也。当寻其源而治之。
目病不治。忍待自愈。或失其宜。有犯禁戒。伤其脉络。遂至深入。又不治之。致搏夹不得
发散。至其年月如期而发。当验其形证丝脉。别何部分。然后治之。
所谓“因风证”，是指患有风病的人同时出现眼部疾病。在五行中，风属木；在五脏中，风对应肝脏；在五官窍穴中，肝开窍于目。这三者本源于同一气机，因此患风病的人，没有不伴有眼病的。然而，眼病必定由特定的诱因引发：有的病程短浅、邪气郁结未深，表现为眼睑偏斜歪倒；有的邪气传入脾脏，导致脾气湿盛，出现眼睑红肿溃烂；有的因血虚筋脉失养而引发震颤抽搐；有的因过度耗损精神，加之嗜好燥热食物，蕴结郁滞而形成内障；有的因风邪亢盛、血液瘀滞，凝结形成外障，如胬肉攀睛等病症。治疗时需根据具体证候，针对病因进行攻伐，内治与外治的方法各不相同。大抵而言，风邪所致的眼病，应当以祛风为首要任务。风邪不去除，眼病终究没有不发作的道理。
所谓“因毒证”，是指人生疮疡肿毒，病情累及眼部。如果患眼病时正值疮毒发作期，治疗使疮毒痊愈，眼病也会随之好转。如果疮毒已愈但眼病未愈，说明邪气已深入至高处的深层部位，难以自行消退，此时应当疏通其根本，澄清其源头。若因此受到强烈刺激，可能会产生瘀滞变证。
因其他病症波及眼部，所导致的病变各不相同。例如：伤寒阳证，热邪郁结，熏蒸损伤瞳神，属于内证；热盛导致血液瘀滞，出现红痛、流泪、干涩，属于外证。阴证脱阳导致目盲，属于内证；服用姜、附等温热药物过多，导致火燥、红赤、干涩，属于外证。疟疾的热邪损伤瞳神，属于内证；火邪滞留于血分导致红赤干涩，属于外证。腹泻痢疾后视力昏暗模糊，是因为谷气匮乏，气机受损无法滋养目窍，属于内证。山岚瘴气导致目昏，是邪气蒙蔽正气，属于外证。蛊胀、中满伴见红痛，是阴虚不能制约阳邪，属于内证。气郁证多伴有情绪抑郁，虚弱证多伴有视物昏花，均属于内证。痰证表现为眼部分泌物黏腻，火证表现为红赤干涩，均属于外证。治疗时应当追溯其根源进行治疗。
眼病若不治疗，指望忍耐等待自愈，或者治疗不当，违反了禁忌戒律，损伤了脉络，致使病邪深入，又不予治疗，导致邪气搏结夹杂，无法发散。到了相应的年月如期发作，此时应当仔细查验其形态证候和细微脉象，辨别所属的经络部位，然后进行治疗。
The "Syndrome Due to Wind" refers to eye diseases occurring in patients suffering from wind disorders. In the Five Elements, wind corresponds to Wood; in the Zang-Fu organs, it corresponds to the Liver; and orifices, the liver opens into the eyes. These three originate from the same Qi. Therefore, individuals with wind disorders invariably present with eye pathology. However, the onset must be triggered by specific causes: some have a short duration with shallow stagnation, manifesting as eyelid deviation or strabismus; some involve transmission to the Spleen, where dampness overcomes, resulting in redness and ulceration of the eyelids; some arise from blood deficiency and weak sinews, causing tremors and convulsions; some result from excessive depletion of spirit, combined with indulgence in dry and hot foods, leading to internal cataracts (Internal Opacity); others stem from excess wind and blood stasis, forming external opacities such as pterygium-like growths. Treatment requires attacking the root cause according to the specific syndrome, with internal and external therapies differing accordingly. Generally, for eye diseases caused by wind, dispelling wind must be the priority. If wind is not eliminated, eye disease will inevitably recur.
The "Syndrome Due to Toxicity" refers to eye diseases secondary to skin sores, ulcers, and toxic swellings. If eye symptoms occur during the active phase of toxicity, curing the toxicity will also resolve the eye condition. If the toxicity resolves but the eye disease persists, it indicates that pathogenic factors have penetrated to the deepest upper regions and cannot retreat spontaneously. In such cases, one must dredge the root and clarify the source. Severe stimulation may lead to complications involving blood stasis.
Eye diseases caused by other syndromes vary in manifestation. For instance: in Yang syndromes of Cold Damage (Shanghan), heat stagnation steams and damages the pupil, constituting an Internal Syndrome; excessive heat and blood stasis causing redness, pain, tearing, and dryness constitute an External Syndrome. Blindness due to Yang collapse in Yin syndromes is an Internal Syndrome; excessive use of warming agents like Ginger and Aconite causing fire-dryness, redness, and dryness is an External Syndrome. Heat from malaria damaging the pupil is an Internal Syndrome; fire stagnating in blood causing redness and dryness is an External Syndrome. Blurred vision after diarrhea/dysentery results from insufficient Grain Qi and damaged Qi failing to nourish, which is an Internal Syndrome. Dim vision due to mountain miasma involves pathogenic qi obscuring healthy qi, which is an External Syndrome. Abdominal distension with fullness and redness/pain results from Yin deficiency failing to control Yang pathogenic factors, which is an Internal Syndrome. Qi stagnation syndromes often involve depression, while deficiency syndromes often involve blurred vision; both are Internal Syndromes. Phlegm syndromes present with sticky secretions, and Fire syndromes present with redness and dryness; both are External Syndromes. Treatment should trace the source and address it accordingly.
If eye diseases are left untreated, hoping for spontaneous recovery through endurance, or if treatment is inappropriate, violating contraindications, damaging meridians and collaterals, allowing pathogens to penetrate deeply, and further neglecting treatment, the pathogens will knot and intertwine, unable to disperse. They will erupt at the predicted time. At this stage, one must carefully examine the morphological signs and subtle pulse characteristics, differentiate the affected meridian/region, and then proceed with treatment.