或问曰。人有昼视通明。夜视罔见。虽有火光月色。终为不能睹物者。何也。答曰。此阳衰不能抗阴之病。谚
所谓雀盲者也。问曰。何以知之。答曰。黄帝生气通天论曰。自古气之通天者。为生之本。天地之间。六合九
州之内。其气无不共贯。人身九窍五脏十二节。皆通乎天气。又曰。阴阳之气。在人平旦阳气生。日中阳气
隆。日西阳气虚。气门乃闭。又曰。阳不胜其阴。则五脏气虚。九窍不通。故知也。问曰。气何以辨其阳耶。答曰。
凡人之气。应之四时者。春夏为阳也。应之一日者。平旦至昏为阳也。应之五脏六腑者。六腑为阳也。问曰。
阳何为而不能抗阴也。答曰。人之有生。以脾胃中州为主。灵兰秘典曰。脾胃者仓廪之官。在五行为土。土
生万物。故为阳气之原。其性好生恶杀。遇春夏乃生长。遇秋冬则敛藏。或有忧思恐怒。劳役饥饱之类。过
而不节。皆能伤动脾胃。脾胃受伤。则阳气下陷。阳气下陷。则五脏六腑之中阳气皆衰。阳气既衰。则五脏
六腑之中阴气独盛。阴气既盛。故阳不能抗也。问曰。何故夜视罔见。答曰。目为肝。肝为足厥阴也。神水为
肾。肾为足少阴也。肝为木。肾为水。水生木。盖亦相生而成也。况怒伤肝。恐伤肾。肝肾受伤。亦不能生也。昼
为阳。天之阳也。昼为阳。人亦应之也。虽受忧思恐怒劳役饥饱之伤。而阳气下陷。遇天之阳盛阴衰之时。
我之阳气虽衰。不得不应之而升也。故犹能昼视通明。夜为阴。天之阴也。夜为阴。人亦应之也。既受忧思
恐怒劳役饥饱之伤。而阳气下陷。遇天阴盛阳衰之时。我之阳气既衰。不得不应之而伏也。故夜视罔所
见也。问曰。何以为治。答曰。镇阴升阳之药。决明夜灵散主之。问曰。病见富贵者乎。贫贱者乎。答曰。忧思恐
怒劳役饥饱。贫贱者固多。富贵者亦不能无之也。
决明夜灵散（治目至夜则昏。虽有灯月。亦不能睹。）
夜明砂（另研二钱） 石决明（醋 二钱） 羯羊肝（一两生用食猪者用家生猪肝勿用外来并母猪伤目）
二药末和匀。以竹刀切肝作二片。以上药铺于一片肝上。以一片合之。用麻皮缠定。勿令药得泄出。淘
米泔水一大碗。连肝药贮砂罐内。不犯铁器。煮至小半碗。临卧。连肝药汁并服。
上方以石决明镇肾阴益精为君。夜明砂升阳主夜明为臣。米泔水主脾胃为佐。肝与肝合。引入肝经
为使。
A question was asked: "Some people see clearly during the day but cannot see at night. Even with firelight or moonlight, they ultimately fail to perceive objects. Why is this?" The answer was: "This is a disease of Yang Qi deficiency unable to counter Yin Qi. It is what the proverb calls 'que mang' (night blindness)." Another question was asked: "How do you know this?" The answer was: "The *Su Wen* chapter on 'Sheng Qi Tong Tian Lun' (Treatise on Vital Qi Connecting with Heaven) states: Since ancient times, Qi connecting with Heaven is the root of life. Within the universe and the nine provinces, Qi is universally interconnected. The nine orifices, five zang organs, and twelve joints of the human body all connect with Heavenly Qi. It also states: In humans, Yin and Yang Qi generate at dawn, peak at noon, and become deficient at dusk, when the 'Qi gates' (pores) close. Furthermore, if Yang fails to overcome Yin, the Qi of the five zang organs becomes deficient, and the nine orifices become obstructed. Thus, we know this." Another question was asked: "How can one distinguish the Yang Qi?" The answer was: "Regarding human Qi responding to the four seasons, Spring and Summer are Yang. Regarding Qi responding to a single day, from dawn to dusk is Yang. Regarding Qi responding to the five zang and six fu organs, the six fu organs are Yang." Another question was asked: "Why can Yang not counter Yin?" The answer was: "Human life relies primarily on the Spleen and Stomach in the middle jiao. The *Ling Lan Mi Dian Lun* (Secret Canon of Spiritual Orchids) states: The Spleen and Stomach are the officials managing granaries; in the Five Elements, they belong to Earth. Earth generates all things, thus serving as the source of Yang Qi. Their nature favors growth and opposes killing; they grow in Spring and Summer and store in Autumn and Winter. If there are excessive worries, thoughts, fears, or anger, or overwork and irregular eating habits that exceed moderation, these can injure the Spleen and Stomach. When the Spleen and Stomach are injured, Yang Qi sinks downward. When Yang Qi sinks, the Yang Qi within the five zang and six fu organs declines. Once Yang Qi declines, Yin Qi within the five zang and six fu organs becomes predominant. With Yin Qi predominant, Yang cannot counter it." Another question was asked: "Why is vision lost at night?" The answer was: "The eyes belong to the Liver, which is the Foot Jueyin channel. The Shen Shui (spiritual water, referring to ocular fluids) belongs to the Kidney, which is the Foot Shaoyin channel. The Liver belongs to Wood, and the Kidney belongs to Water. Water generates Wood, representing a mutually generating relationship. Moreover, anger injures the Liver, and fear injures the Kidney. If the Liver and Kidney are injured, they cannot generate each other. Daytime is Yang, representing Heavenly Yang; daytime is Yang, and humans correspond to it. Although injured by worries, anger, overwork, etc., causing Yang Qi to sink, when encountering the time of Heavenly Yang abundance and Yin deficiency, our own Yang Qi, though weak, must rise in correspondence. Thus, vision remains clear during the day. Nighttime is Yin, representing Heavenly Yin; nighttime is Yin, and humans correspond to it. Having been injured by worries, anger, etc., causing Yang Qi to sink, and encountering the time of Heavenly Yin abundance and Yang deficiency, our own Yang Qi, already weak, must subside in correspondence. Thus, vision is lost at night." Another question was asked: "How should it be treated?" The answer was: "Use medicines that suppress Yin and raise Yang, primarily using Jueming Yeling San." Another question was asked: "Does this disease appear in the rich and noble, or the poor and humble?" The answer was: "Worries, anger, overwork, and irregular eating are indeed common among the poor and humble, but the rich and noble are not exempt from them."
Jueming Yeling San (Cassia Seed and Bat Dropping Decoction) (Treats eyes becoming dim at night; even with lamp light or moonlight, objects cannot be seen.)
Ye Ming Sha (Night-bright Sand / Crotalariae Semen, prepared separately, 2 qian) Shi Jue Ming (Abalone Shell / Haliotidis Concha, vinegar-processed, 2 qian) Jie Yang Gan (Ram Liver / Ovis Aries Hepatis, 1 liang, used raw; if using Pig Liver / Sus Scrofa Domesticus Hepatis, use domestic pig liver only, not wild or sow's liver, to avoid eye injury.)
Grind the two medicines into powder and mix evenly. Cut the liver into two slices with a bamboo knife. Spread the medicine powder on one slice, cover with the other slice, and bind tightly with hemp rope to prevent leakage. Take one large bowl of rice washing water. Place the liver and medicine in a clay pot, ensuring no contact with iron vessels. Boil until only a small half-bowl remains. Before going to bed, consume both the liver and the medicinal juice together.
In the above formula, Shi Jue Ming (Haliotidis Concha) suppresses Kidney Yin and benefits essence as the Sovereign drug; Ye Ming Sha (Crotalariae Semen) raises Yang Qi and treats night blindness as the Minister drug; Rice Washing Water (Oryzae Sativa Aqua) regulates the Spleen and Stomach as the Assistant drug; The combination of Liver with Liver guides the formula into the Liver Channel as the Envoy drug.