A visual acuity of 5.0 is normal and indicates good vision. In international standards, vision 5.0 is within the normal range of vision. 5.0 vision is better for adults because there are more electronic products and the probability of myopia in young eyes is higher. If a child’s visual acuity is less than or equal to 4.9, it is normal vision, because children are in the golden period of development, the adjustment ability is relatively strong, there is a possibility of recovery. If the vision is between 5.0 and 5.2, it is a normal range of vision and does not require glasses. You can eat more green leafy vegetables, carrots or blueberries to help your eyesight. People who often work in front of the computer, adhere to drink chrysanthemum tea every day, adhere to do eye exercises, can also protect the eyes and improve vision.