If a diabetic patient suddenly experiences loss of vision, i.e., the eye cannot see, it is recommended that he or she be promptly seen by a hospital. The specific reasons are as follows: 1, most of the blindness of diabetic patients is due to long-term poor blood sugar control, retinal lesions, resulting in massive bleeding, pulling down the retina, that is, the occurrence of retinal detachment; 2, loss of vision in diabetes can lead to macular degeneration, and these two complications of diabetes that lead to loss of vision are more difficult to treat, and their prognosis is also poor, which can cause a serious decline in the quality of life. A person who is blind in both eyes and enters the dark world has a greater quality of life, including mood and impact on family members, and it is not desirable for diabetic patients to enter this stage. diabetic patients who are more than 10 years old should visit the ophthalmology department once a year for a formal fundus examination and intraocular pressure examination to detect diabetic retinopathy at an early stage and to carry out early treatment. Early treatment is more effective and can maintain long-lasting vision.