天下之目瞽于病者半，瞽于医者亦半。医者自瞽其心，而欲不瞽天下人之目，势必不能
。余二
十年中，走南北数千里，见医者千百辈，医目者亦百十辈，其能起沉 ，疗痼疾，曾不得数
人焉。而因噎废食者，遂创目不医不瞎之说。呜呼，是说起而天下之目胥受其祸矣。然亦由
不善治目者之有以祸之也。桐乡顾养吾先生，悯天下之且受其祸，而不能遍为之救，乃出生
平所学，参以古大家之论，着为《银海指南》四卷。辨轮廓，所以明经络也。戒钩割，所以
养精血也。至于七情六淫，分致疾之原，五脏六腑，表主病之象。辨脉辨舌，不厌其详，用
药用方，贵充其类。可兼症患病情之变，存医案准治法之宜，可谓大无不包，细无不入已。
前年冬，余以先大夫忧旋里，获读先生书，知先生之学，固不仅以治目名也。忆乾隆庚戌间
，
伯兄遘目疾逾半载，手足复肿痛不能运动，诸医以温凉补泻之药，轻投之，两目几瞽，而余
疾不少衰。迨后先生至，笑谓先大夫曰∶是湿热壅滞所致，疗之至易。如其法而患痊。盖先
生之于医无不通，而治目其绪余耳。先生与先大夫为莫逆交，余少时习闻先生教，略通素问
灵枢之义。今海内莫不宗仰先生，得是书以广其传，庶几言医者不致瞽其心，而天下之人亦
不致瞽其目也。是为序。
嘉庆己巳冬世愚侄海盐朱方增拜撰
天下因眼病而失明的人占一半，因医生误治而导致失明的人也占一半。如果医生自己内心昏昧不明，却想不让天下人的眼睛失明，那势必是不可能的。
我在二十年间，奔走南北数千里，见过成百上千的医生，其中医术高明、能治愈眼疾的也只有几十位。那些能够挽救危重眼病、治疗顽固眼疾的，甚至不到几个人。于是有些人因为害怕风险就放弃治疗（因噎废食），便创立了“眼睛有病不能医治，否则会瞎”的说法。唉，这种说法一出现，天下的眼病患者都遭受了祸害。但这也不全是患者的错，也是由于那些不善于治疗眼病的医生造成了危害。
桐乡顾养吾先生，怜悯天下人正遭受这种祸害，却又无法普遍地去救助他们，于是拿出他平生所学的医术，参考古代名医的论述，撰写了《银海指南》四卷。书中辨别眼部轮廓，是为了阐明经络；告诫不要随意使用钩割手术，是为了保养精血。至于七情（喜、怒、忧、思、悲、恐、惊）和六淫（风、寒、暑、湿、燥、火），分别分析致病的原因；五脏六腑，标示出主要疾病的征象。辨别脉象和舌象，不厌其烦地详尽阐述；使用药物和方剂，贵在充实其种类。书中涵盖了兼症、患病情况的变通，保存了医案以作为治疗方法的准则，可以说是大处无不包罗，小处无不深入。
前年冬天，我因为父亲去世守孝回到故乡，得以阅读先生的著作，知道先生的学问，本来就不只是以治疗眼病而闻名。回忆乾隆庚戌年间，我的长兄患眼病半年多，手脚又肿痛不能活动，各位医生用温凉补泻的药物，轻微投药，导致双眼几乎失明，而我的疾病也没有丝毫减轻。后来先生到来，笑着对先父说：“这是湿热壅滞所致，治疗起来非常容易。”按照他的方法，患者痊愈了。大概先生对于医学没有不通晓的，而治疗眼病只是他医术中的余绪罢了。先生与先父是生死之交，我年少时经常听闻先生的教诲，大致通晓《素问》和《灵枢》的含义。如今海内之人无不尊崇仰慕先生，得到这本书来广泛传播，或许能让行医的人不至于内心昏昧，而天下的人也不至于眼睛失明。这就是序言。
嘉庆己巳年冬天，世愚侄海盐朱方增敬撰
Half of those in the world who are blinded by eye diseases are so due to the diseases themselves, and half are so due to the physicians. If a physician is mentally blind (lacks insight) himself, yet desires not to blind the eyes of the people of the world, it is inevitably impossible.
Over the course of twenty years, I traveled thousands of li north and south, witnessing hundreds of physicians, among whom only dozens were skilled in treating eye conditions. Among them, those capable of rescuing critical cases and curing chronic stubborn diseases numbered even fewer than ten. Consequently, some, fearing complications like giving up eating because of choking, invented the theory that "eye diseases cannot be treated, or blindness will result." Alas, once this theory arose, the eyes of all under heaven suffered its calamity. However, this was also caused by those who were incompetent in treating eye diseases. Mr. Gu Yangwu from Tongxiang, pitying that the people of the world were suffering this calamity and unable to save them all, brought forth his lifelong medical knowledge, incorporated the theories of ancient masters, and authored *Yinhai Zhinan* (Guide to the Silver Sea), four volumes. By distinguishing the contours of the eye, he clarifies the meridians; by warning against unnecessary hook-and-cut surgeries, he preserves essence and blood. Regarding the Seven Emotions (Qing: joy, anger, worry, thought, sadness, fear, fright) and Six Evils (Linyin: wind, cold, summer-heat, dampness, dryness, fire), he analyzes their origins in causing disease; regarding the Five Zang and Six Fu organs, he indicates the manifestations of primary diseases. In differentiating pulse and tongue, he leaves no detail unexamined; in using herbs and formulas, he emphasizes comprehensiveness. He covers variations in concurrent symptoms and disease progression, preserving medical records as standards for appropriate treatment methods. It can be said that nothing is too large to encompass, nor too small to penetrate.
Last winter, upon returning home to mourn my late father, I had the opportunity to read Mr. Gu's book and realized that his scholarship was not merely renowned for treating eye diseases. I recall the year Gengxu of the Qianlong reign, when my elder brother suffered from an eye disease for over half a year, accompanied by swelling and pain in his hands and feet that prevented movement. Various physicians administered mild doses of warming, cooling, tonifying, and purgative medicines, resulting in near-blindness in both eyes, while my own condition did not improve slightly. Later, when Mr. Gu arrived, he smiled and said to my late father, "This is caused by stagnation of damp-heat; treating it is very easy." Following his method, the patient recovered. Indeed, Mr. Gu was proficient in all aspects of medicine, and treating eye diseases was but a minor extension of his expertise. Mr. Gu and my late father were bosom friends. In my youth, I frequently heard his teachings and gained a basic understanding of the *Suwen* (Basic Questions) and *Lingshu* (Spiritual Pivot). Today, everyone in the land reveres and looks up to Mr. Gu. With this book to spread his teachings widely, it is hoped that practitioners will not become mentally blind, and the people of the world will not suffer physical blindness. This is the preface.
Written with respect by Zhu Fangzeng, humble nephew from Haiyan, in the winter of the Jisi year of the Jiaqing reign.