Normal visual acuity is generally set at 1.0 because the vast majority of people have visual acuity of 1.0 and above. The child’s visual acuity is 0.8, which may be a hair less than 1.0. Is it necessarily abnormal if it does not meet the normal standard? Not necessarily, but we need to combine it with the age of the child. If the child’s vision is only 0.8 at the age of 8-9 years old, it is still not up to standard and further examination is needed. However, if a three-year-old child has a vision of 0.8, it is considered normal. Because each age group has its own lower limit of visual acuity for the corresponding age group, only when the lower limit of visual acuity is not reached is the child considered to have a problem with visual development. The lower limit of vision is 0.5 for three-year-olds, 0.6 for 4-5-year-olds, 0.7 for six-year-olds, and 0.8 for seven-year-olds and above. so whether 0.8 is normal or not depends on the combination of the child’s vision and age.