龙胆紫又名甲紫,是一种收敛药,用于粘膜及皮肤溃疡,眼科常用于泪囊手术前注入作标志。有0.5％、1％、2％几种溶液,眼科常用最低浓度,一般无副作用。作者遇1例误用1％龙胆紫注入泪囊又未挤压净返流入结膜囊内而引起点状角膜炎。为了吸取教训,持报告如下。患者女,56岁。因患右侧慢性化脓性泪囊炎7年,经长期治疗无效要求手术。术前于泪囊内注入1％龙胆紫1毫升,大部分药液返流入结膜囊,致使结膜角膜呈深蓝色,立即用生理盐水反复冲洗,使其结、角膜面色泽变淡。在局麻下行右泪囊 Gentian violet also known as purple, is an astringent drug for mucosal and skin ulcers, ophthalmology often used before lacrimal surgery for injection. There are 0.5%, 1%, 2% several solutions, the lowest concentration commonly used in ophthalmology, generally no side effects. The authors encountered a case of misuse of 1% gentian violet into the lacrimal sac did not squeeze the net flow back into the conjunctival sac caused by punctate keratitis. In order to learn the lesson, the report is as follows. Female patient, 56 years old. Suffering from the right side of chronic suppurative dacryocystitis for 7 years, after long-term treatment ineffective surgery. Preoperative injection of 1% of 1% gentian violet in the lacrimal sac, most of the liquid back into the conjunctival sac, resulting in conjunctival corneal dark blue, rinse immediately with saline, to knot, corneal surface fades. Local anesthesia right lacrimal sac