Cataract is one of the major blinding eye diseases in China, and with the aging population, the incidence of cataract continues to rise. At present, cataract ultrasound emulsification combined with IOL implantation has achieved great success in treating cataract, but many patients feel uncomfortable in their eyes for a period of time after surgery, such as dry eyes, grinding, sometimes clear and sometimes blurred vision, and tearing, etc. The emergence of these new problems requires cataract surgeons to pay attention to a brand new topic – -dry eye after cataract surgery. The following is an analysis of the possible causes and treatment. I. Etiological analysis 1. Age Those who need cataract surgery are usually elderly people. The quantity, quality and stability of their own tears are declining with age, and their resistance to the outside world is poor. Almost all elderly patients have spherical conjunctival laxity (just like skin laxity) Many cataract patients also have combined pterygium and lid lacrimation Older patients have lid gland dysfunction and abnormal lipid secretion If combined with medical problems such as diabetes, they are more likely to have dry eyes. Thus, in the vast majority of elderly cataract patients, dry eye exists preoperatively! This is the main reason. 2. Surgery Cataract ultrasound emulsification combined with IOL implantation is a very mature technology. The operation and ultrasound energy associated with the surgery may aggravate dry eye, but this generally subsides gradually after surgery as the wound heals and the inflammation is controlled. II. Treatment 1. Pre-operative preparation For patients with dry eye before surgery, some symptomatic treatments can be given before surgery, such as surgical removal of obvious pterygium, local drops of moisturizing artificial tears, hot compresses, ensuring sleep, reducing reading and use of electronic products, controlling stable blood sugar, and emotional stability. 2.Postoperative treatment Local use of artificial tears and other moisturizing products, no abuse of local eye drops, avoid eye fatigue, reasonable optometry and prescription, avoid the stimulation of strong light, high wind, dry environment in air conditioning, oral B vitamins and omega-3, etc.