Whether a child’s vision of 4.7 falls within the normal range needs to be determined based on age. Generally, children under five years old with a vision of 4.7 are in the normal range, while children over five years old with a vision of 4.7 are not in the normal range and need to seek medical treatment. A newborn baby’s vision is usually around 0.5 to 0.6, after one year of age it is almost 1.0 to 1.5, and between two and three years of age it can reach 3.0 to 4.0. Children between three and five years of age usually have a vision of around 5.0, and 4.7 is still within the normal range for children under five years of age. Children six years of age and older generally have visual acuity between 7.0 and 10.0. Children six years of age and older with visual acuity of 4.7 are more likely to have a refractive error, and may have a developmental problem. It is recommended that children aged six and above should go to the ophthalmology department of a regular hospital for examination and treatment if their visual acuity is 5.0 or above. Most children are exposed to electronic products, and when watching them, they should maintain a good sitting posture and control the time, as well as do proper eye exercises to relieve eye fatigue.