Suggestion: Soaking black beans with vinegar is a health-preserving method, which has the functions of beautifying, losing weight, tonifying kidney, improving eyesight, blackening hair and whitening skin, and can effectively improve constipation, hypertension, hyperlipidemia, backache and leg pain, diabetes, prostate disease, white hair, coronary heart disease, and vision loss, eye pain, dryness, dizziness, headache and other symptoms caused by long-term watching computer and TV. At the same time, soaking black beans in vinegar has a good effect on improving myopia and other eye diseases.