Hello, black beans soaked in vinegar have the functions of beautifying, losing weight, tonifying kidney, improving eyesight and blackening hair, and can effectively improve constipation, hypertension, hyperlipidemia, backache and leg pain, diabetes, prostate disease, gray hair, coronary heart disease, decreased vision, eye pain, dryness, dizziness, headache and other symptoms caused by watching computer or TV for a long time. At the same time, soaking black beans in vinegar has a good effect on improving myopia and other eye diseases. It is recommended to eat the green one inside.