1. Prevention of dehydration In case of dehydration, the normal metabolism of fluid in the body is disturbed, and some abnormal chemicals will be produced to damage the lens and lead to cataracts, while for patients with existing cataracts, dehydration can aggravate the condition. Therefore, once you encounter diarrhea and vomiting caused by various reasons, or sweating a lot in high temperature conditions, you should rehydrate in time, and in general, you can just drink plain water and tea. 2, wear dark glasses The longer you are exposed to the sun’s ultraviolet rays, the greater the likelihood of cataracts. Studies have pointed out that wearing dark glasses when going out can reduce the exposure of the eyes to ultraviolet rays. For elderly people whose vision declines after the age of 60, wearing tawny sunglasses can prevent further vision loss and cataracts. 3. Take aspirin appropriately The amino acid level in the body of elderly cataract patients tends to be higher, among which tryptophan is the only amino acid that can be combined with plasma protein. Tryptophan and its metabolites combine with crystalline proteins and turn into brownish-yellow substances and deposit in the crystal, forming cataracts. Aspirin, on the other hand, competes with tryptophan to bind to crystallin, thereby decreasing intracrystalline tryptophan levels. Research also believes that aspirin also has the effect of slowing down the progress of cataract disease, but the drug is more irritating to the gastric mucosa, so it should be taken after meals. 4, intake of sufficient vitamin C The content of vitamin C in the human eye is about 30 times higher than in the blood. As we age, the nutrient absorption function and metabolic function gradually decreases, the lens becomes malnourished and the vitamin C content decreases significantly, which causes lens degeneration over time and leads to cataracts. Vitamin C can also weaken the damage of light and oxygen to the lens, which has the effect of preventing the formation of senile cataract.