Analysis of dry eye after cataract surgery may have the following causes: 1, surgical trauma: surgical incisions and intraoperative operations can damage some conjunctival cupped cells and reduce the secretion of mucin; 2, postoperative inflammation: postoperative congestion and inflammatory reactions promote damage to the cornea and aggravate dry eye symptoms. 3, frequent postoperative long-term application of a variety of eye drops containing preservatives such as benztropine: the toxic effect of preservatives can weaken the adhesion of mucin to the ocular surface epithelium, leading to tear film instability; 4, systemic metabolic diseases to nutritional disorders: diabetes can lead to metabolic disorders, and prolonged illness may affect the quality and quantity of tear secretion.