There is no best way to prevent cataract. Cataract is a visually impaired disease caused by reduced transparency or color change of the lens, the pathogenesis of which is more complex, and is the result of the long-term combined effect of factors inside and outside the organism on the lens. There are no effective measures to prevent cataract, but patients can improve their living habits to alleviate the condition. When people go out, they can wear sunglasses with anti-ultraviolet rays to avoid damage from ultraviolet rays. They also need to avoid dehydration and metabolic disorders caused by diarrhea or prolonged and heavy sweating, which can produce abnormal chemicals and damage the crystals, leading to clouding of the lens. People also need to pay attention to supplement enough vitamin C, vitamin C has an antioxidant effect, help to maintain eye health. People also need to avoid excessive smoking, drinking, pay attention to protect the eyes, and reading, writing, watching TV time should be properly controlled. At the same time, avoid long-term application of pupil shrinking agents or corticosteroids and other drugs, or may lead to clouding of the lens. It is recommended that cataract patients should visit the hospital in time to assess their condition and follow the doctor’s instructions for treatment.