All causes such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc. can cause disorders of lens metabolism, resulting in clouding of the lens proteins, called cataracts. Cataracts are most common in people over the age of 40, and their incidence increases with age. Cataracts are one of the most common eye diseases in the elderly and can be dangerous and serious enough to cause blindness. Cataracts cause problems in the lives of many patients, and no one wants to see them happen. So what are the ways to prevent cataracts? 1.Avoid strong sunlight exposure. When you are outdoors, bring sunglasses or sun hat. 2.Strengthen eye hygiene, do not rub your eyes with your hands, do not use unclean handkerchiefs or towels to wipe or wash your eyes. After excessive eye use, you should relax properly. 3. Pay attention to emotional regulation and do not get angry at random. 4.The prevention of cataract is recommended to eat foods rich in protein, calcium and trace elements, and more foods containing vitamin A, B, C and D. Drink more water, eat less salt, and eat more fish in general. 5, long-term smokers are prone to cataracts, cataract prevention should quit smoking early.