The standard visual acuity of a five-year-old child should be between 0.6 and 0.8, all of which fall within the normal range. If a five-year-old’s vision is not within this range, for example, below 0.5, it means that the child’s eyes may have certain diseases, commonly including refractive error, amblyopia, congenital cataract, etc. If your child’s vision is not within the normal range, you must go to a regular hospital for a detailed examination, including visual acuity examination, optometry examination, intraocular pressure examination and fundus examination, through the above-mentioned routine examination, you can clarify the specific causes of vision loss, and then carry out targeted treatment. If it is refractive error, you need to wear glasses early to improve vision; if it is amblyopia, you need to carry out active amblyopia treatment and training, only early treatment can make vision recovery, if you miss the best treatment period, vision recovery will be very difficult.