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Shennong tasted a hundred herbs, and Qibo formulated medical texts. Medicines possess sour, bitter, sweet, pungent, and salty flavors, while diseases are categorized into cold, heat, warmth, and coolness conditions. Some arise from external contraction of the four Qi (Wind, Cold, Summer-heat, Dampness), others from internal injury by the seven emotions (Joy, Anger, Worry, Thought, Sorrow, Fear, Fright). In summer, one may fear heat and sleep on damp surfaces; in winter, one may fear cold and sleep on heated kang beds. Overconsumption of fried, roasted, and grilled foods, along with intense study of classics that damages the spirit, can occur. Occasionally contracting even minor eye ailments requires strict abstinence from alcohol and sexual indulgence first. Initially, there is redness, swelling, pain, and dryness; severely, hot obstructions gradually develop. There are twenty-three types of internal obstructions and various named external obstructions referred to as "Four-Nine." Pox and rashes or Yuefeng (a type of ophthalmic disease) damage the eyelids; rotting eyelid margins and trichiasis gradually form. Damage to Earth element or pox scarring leads to nebulae (corneal opacities), yet there are wonderful methods to preserve vision.

I have received miraculous secrets passed down from immortals and will describe the functions of medicines: Calcined Calamine (Lu Ganshi), prepared with subtle methods, is the principal medicine for the eyes; Cinnabar (Zhusha) clears the pupil and stabilizes the lens, and can also fill depressions. Pearl (Zhenzhu) restrains nebulae and membranes while stabilizing the essence and pupil; Amber (Hupo) removes blood vessels and distinguishes black from white. Eagle feces remove various nebulae; Elecampane (E Bushi) and Glehnia Root (Qianliguang) have similar effects. Large black spiders open nebulae, but flower spiders are superior. To open various nebulae, use Cicada Slough (Chantui), Feng Tui, Silkworm Slough (Can Tui), Human Slough (Ren Tui), and Snake Slough (Shetui). To remove thick membranes, [missing character] is effective. Muscone (Shenao) opens blockages, with significant efficacy for wind-fire syndromes; Borax (Pengsha) treats photophobia, with immediate effect on itching and dryness. Mirabilite (Xuanmingfen) extremely reduces various heat conditions; Autumn Stone (Qiushi) can sweep away white clouds (cataracts). Stone Swallow (Shiyan) and Stone Crab (Shixie) reduce nebulae and treat entropion (quanmao); Chrysocolla (Tonglv) and Lead Powder (Shuifen) contract eyelid margins and eliminate wind tears. Cuttlebone (Piaoxiao) removes hot tears; Calomel (Qingfen) contracts watery overflow. Gentle fire fumigation has the effect of dispelling wind; [missing character] sand has the function of rotting flesh; proper application requires mastering the secret formula. Glehnia Root (Qianliguang) can be used in various prescriptions; Elecampane (E Bushi) works alongside other herbs. Realgar (Xionghuang) removes heat obstructions; Human Milk (Renru) nourishes blood deficiency. For long-standing rotting eyelid margins where the root of the nebula persists, Ascaris expulsion therapy (Tu Hui Chong) is required. For long-standing Qingmang (blindness with clear appearance of eyes), only Akitaka (Kongqing) is used. For prolonged wind obstruction causing unbearable itching, wash with Qingming Yangye; for long-standing epidermal covering hypodermal tissue (pterygium), apply Fish Bladder (Yubiao). Winter Mulberry Leaf (Dongsangye) is good for washing millet-like grains; Halitux (Shijueming) better treats various cloudiness. The formulas for preparing medicines and their oral instructions were transmitted by masters. For sudden onset Fire Eye (acute conjunctivitis), although it is heat, cooling agents should not be used; for long-standing nebula and darkness, cooling is appropriate but not too heating. It is laughable that vulgar techniques rapidly puncture Taiyang (BL67) for Fire Eye; it is also ridiculed that quacks use hooking and cutting for cloudiness. Eyes require blood nourishment, akin to rice being watered. Knife cutting and needle picking cause lifelong disability; harsh herbal washing ruins a lifetime. Alas! Quacks harm the Heaven's virtue of cherishing life; must one not be cautious? These few lines of vernacular words carry deep meaning. Fellow experts, please examine them carefully, so as not to mislead people's eyes.