Cataracts rank first among all eye diseases in terms of blindness. Because of the high incidence of the disease, the poor effectiveness of drug treatment, and the fear of surgery in many patients, cataract prevention is of great importance to protect the vision of the elderly. So, what can people do to prevent cataracts? The following are some precautions for daily life: 1. Wear sunglasses when going out: long-term exposure to sunlight is a common cause of cataracts, so to avoid this, people can wear sunglasses when going out to resist sunlight. The sunglasses with yellowish brown lenses are the most effective in protecting against sunlight. In addition, some poor eyesight, not convenient to wear sunglasses for the elderly can wear a hat with a large edge when going out, which can also prevent direct sunlight on the eyes. 2. Drink more water: Dehydration is one of the main causes of senile cataract. Therefore, once elderly people, especially those with early senile cataract, encounter dehydration such as diarrhea, vomiting or sweating under high temperature conditions, they should rehydrate in time to prevent or delay the occurrence of cataract. The liquid should be plain water or light tea water. 3, to eat more food rich in vitamin C: vitamin C is the main nutrient to maintain the various functions of the human eye, the content of vitamin C in the human eye is 30 times higher than the content of vitamin C in the human blood. As the elderly age, the absorption and metabolic function will gradually decline, which will lead to a significant decline in the content of vitamin C in their eyes, which can cause lens degeneration over time, leading to cataracts. Therefore, the elderly can effectively prevent cataracts by eating more vitamin C-rich foods. Foods rich in vitamin C include spinach, string beans, cabbage, cabbage, apples, oranges, citrus and grapefruit. At the same time, the elderly can also prevent cataracts if they take appropriate supplements of glutathione, vitamin B1, vitamin B2, vitamin E and selenium. In addition, early cataract patients can take 100 to 200 mg of vitamin C tablets daily, which can effectively inhibit or delay the growth of cataract. 4, can be appropriate to take aspirin: aspirin belongs to the antipyretic and analgesic class of drugs, with antipyretic, anti-inflammatory, analgesic, anti-thrombotic, anti-rheumatic role. The latest research found that aspirin also has the effect of delaying the growth of cataracts. Therefore, the elderly and patients with early cataracts can take enteric-soluble aspirin tablets regularly to prevent cataracts. The usage of the drug is 0.1 to 1 mg per kg of body weight per day for adults. 5.To control blood sugar: Diabetes is a common disease in the elderly. And cataract is a common complication of diabetes. Therefore, once a diabetic patient appears to see distant objects very clearly. Therefore, once a diabetic patient has a clear vision of distant objects but not near objects, or a clear vision of near objects but not far objects, he should go to the hospital to check his blood sugar and eyes in time to prevent the occurrence of cataracts. In addition, the elderly should actively treat diseases that can complicate cataracts such as hypothyroidism, eat less salt, smoke less, prevent mechanical damage to the eyes, and do eye exercises regularly in order to improve the resistance of the eyes and prevent cataracts and other eye diseases.