Gù Xī 顧錫 (zì Yǎngwú 養吾), mid-to-late Qīng physician of Tóngxiāng 桐鄉 (north Zhèjiāng), active in the late Qiánlóng 乾隆 to early Dàoguāng 道光 reigns. He was a broadly trained internist who became, in his later years, the most celebrated ophthalmologist of the Sōngjiāng / Tóngxiāng region and built a multi-decade practice in Sōngjùn 松郡 (Sōngjiāng 松江, Jiāngsū). According to the preface to his Yínhǎi zhǐnán 銀海指南 (KR3em012) by his patron Zhū Fāngzēng 朱方增, Gù Xī was already an established physician in 1790 when he cured Zhū’s elder brother of damp-heat ocular obstruction with limb-swelling; the same preface treats Gù Xī as a senior figure in 1809. Birth and death years cannot be tightly bracketed from the prefatorial evidence, but he must have been born no later than the 1750s and was active into the late 1800s decade. He is not in CBDB. Doctrinally Gù Xī aligned himself with the bǔyì 補益 tonifying-supplementing tradition of 李杲 Lǐ Dōngyuán, 朱震亨 Zhū Dānxī, 薛己 Xuē Jǐ, and 張介賓 Zhāng Jièbīn, and was openly critical of the gōngxié 攻邪 attacking-evils school of 張從正 Zhāng Cóngzhèng. His extant work in the Kanripo corpus is the four-juan Yínhǎi zhǐnán (KR3em012), compiled in 1807 by his disciple Shū Fēn 殳芬 from a large clinical archive and printed in 1809–1810.