Diabetes mellitus is a very common and highly prevalent disease that can lead to complications in multiple organs throughout the body and even serious complications, so it should be taken very seriously. DM prevalence: 194 million worldwide (2003), about 56 million in China, 4.37% . The dangers of diabetes: diabetes causes damage to large and small blood vessels and multiple organs throughout the body, and a variety of complications are formed, which can lead to double vision, with double vision ranking first in ophthalmology. The number of people with double vision caused by diabetic eye disease is 25 times higher than that of non-diabetic people. It reduces the quality of life and loss of labor force. Increased burden on society (medical costs have become a major burden on society, costing $170 billion per year for a large country of 1.3 billion people. ) Current problems: Many patients do not know enough about diabetes and its eye comorbidities, and some of them only find out they have diabetes when they come to the clinic with diabetic eye disease; or they know they have diabetes but do not come to the ophthalmologist until they have eye problems, when the eye disease is already heavy and the treatment is poor, so it is important to have an early eye examination when you have diabetes. Remind patients: (1) Regular check-ups must not be forgotten! Normal vision may also complications have occurred! Early detection, reasonable treatment. (2) What are the requirements for regular checkups? When there is no diabetic fundus lesion: If the blood sugar control is stable, the fundus should be examined once every six months with dilated pupil; if the blood sugar control is unstable, it should be examined once every three months; if the eye has a history of internal eye surgery (cataract surgery, glaucoma surgery, vitrectomy, etc.) and the fundus has lesions, the interval of eye examination should be shortened or reviewed according to medical advice.