Diabetes can cause a variety of eye diseases, such as corneal ulcers, glaucoma, vitreous hemorrhage, optic neuropathy, and most commonly retinopathy. The prevalence of diabetic retinopathy varies with the course of diabetes. The incidence of retinopathy in diabetic patients ranges from 21 to 36% and has the greatest impact on vision. When diabetes is complicated by eye disease, patients are more aware that diabetes can cause retinopathy. In fact, as the duration of diabetes lengthens, the effects on the eyes become more and more obvious. In addition to the commonly referred to diabetic retinopathy, there are also the following types of eye diseases: (1) Myopia: This is manifested by the occurrence of myopia in people who are not myopic or the constant change in eye prescription in people who are already myopic. While replacing glasses, the possibility of diabetes should be thought of. (2) Eyelid ptosis: Sudden onset of ptosis on one side of the eyelid (upper eyelid drooping, unable to open the eye), older patients have a more acute onset, mostly on one side, accompanied by facial pain, while eye movement is limited, appearing to see things in double shadows, it is necessary to find a doctor in time to make the correct diagnosis and treatment. (3) Cataract: It often manifests as a gradual decrease in visual acuity. (4) Paralytic strabismus: It usually starts suddenly and manifests as seeing things in double shadows and limited eye movements. The appearance of the eye is skewed outward or inward. Patients may feel dizzy, walk unsteadily, or in severe cases, become nauseous and vomit, and the cause should be promptly identified and treated aggressively. Once these conditions occur in middle-aged, elderly and diabetic patients, it is important to go to the hospital for examination in order to prevent diabetic eye disease.