Elderly diabetes may lead to cataracts when blood glucose levels are poorly controlled over time, resulting in chronically elevated blood sugar. Diabetes is a disease characterized by chronic hyperglycemia. When blood sugar is elevated for a long period of time, it can lead to abnormal metabolism of crystalline proteins, causing clouding and swelling of crystals, resulting in cataracts. At the same time, cataract is also a disease that occurs easily in the elderly and has a high incidence, mostly due to the ageing of the crystalline proteins, which leads to the clouding of the crystalline lens. Therefore, the elderly diabetes, need to actively cooperate with the doctor to control blood glucose, so that the blood glucose value in the normal range, at the same time actively adjust the diet structure to control blood glucose.