Sudden drooping of eyelids in diabetic elderly may be related to cerebrovascular disease, motor nerve palsy, myasthenia gravis and so on. 1. Cerebrovascular disease: diabetic patients are prone to atherosclerosis, which causes ischemia or even occlusion of blood vessels in the brain supplying the ophthalmic meridian, resulting in sudden drooping of the eyelids, usually in one eye, and also limitation of inward, upward, or downward movement of the eyeballs, resulting in diplopia. 2. Motor nerve palsy: the upper eyelid muscle is innervated by the motor nerve, and complete and incomplete ptosis often occurs after motor nerve palsy. It may be accompanied by pupil dilation and decreased or absent light reflex. 3. Myasthenia gravis: It is an autoimmune disease that can involve all the muscles of the whole body, and can be manifested as drooping eyelids, difficulty in swallowing, weakness in speech, and even respiratory difficulties. Diabetic elderly suddenly drooping eyelids should be timely to the hospital to identify the cause, under the guidance of the doctor according to the cause of standardized treatment.