Tear duct disease is one of the most common diseases in ophthalmology. With the development of society and the improvement of people’s material living standards, lacrimal tract diseases are increasingly being paid attention to clinically, while its treatment mode has also undergone fundamental changes in recent years, and the concept of “minimally invasive” is increasingly accepted by the world. The combination of lacrimal micro-tube placement to improve the efficacy of treatment has expanded the scope for further diagnosis and treatment of lacrimal tract disease. The lacrimal endoscope is currently the only examination method that allows direct observation of the lacrimal mucosa and lacrimal lining in detail. The morphology has inner wall mucosa thickening, roughness, congestion; the secretion presents white, yellow thin or mucous-purulent, after flushing see the secretion move, reduce and other states. The inner wall of the anastomosis between the lacrimal sac and the nasal mucosa in patients with recurrence after lacrimal sac nasal anastomosis surgery was also observed. It is also possible to observe lesions such as lacrimal stones, foreign bodies, and tumors. Minimally invasive surgery has always been the goal of our ophthalmology colleagues. The application of lacrimal endoscopy provides us with the space for direct vision, the so-called “third eye”. We hope to make full use of minimally invasive technology in our clinical work to maximize the cure rate, reduce tear damage, and truly bring the lacrimal tract treatment to a new level of minimally invasive.