A bare eye visual acuity of 4.5 in an 8-year-old child is below normal, and it is necessary to find out what causes the vision loss before treatment. For example, if the vision loss is caused by refractive error, glasses can be worn to correct it; if it is caused by amblyopia, amblyopia training is needed to improve the vision. Under normal circumstances, 8-year-old children with naked eye vision should have developed to 5.0, only 4.5 is significantly lower than normal, parents should take the child to the hospital ophthalmology department for a detailed examination to find out the specific causes, the more common refractive error, amblyopia and so on. Loss of vision in the naked eye caused by refractive error can be diagnosed through optometry and subsequently corrected by prescription of spectacles. The vision loss caused by amblyopia, even after wearing glasses to correct the vision can not be restored to normal, it is necessary to do amblyopia training to improve vision, amblyopia training is required to adhere to the regularity, and is not a short-term cure for amblyopia. At the age of 8, the visual acuity of 4.5 is unqualified, and it is recommended to go to the hospital in time for consultation and timely correction and treatment.