People usually take the vision of not less than 1.0(5.0) as the criterion for judging normal vision, but this criterion is not completely applicable to young children. Because preschool children's eyesight is still developing, it is relatively stable after 6 years old. For children of different ages, different standards should be adopted to judge whether their eyesight is abnormal.
Usually, the visual acuity of 3-year-old children is ≥0.5(4.7), 4-year-old children is ≥0.6(4.8), 5-year-old children is ≥0.8(4.9), and 6-year-old children is ≥ 1.0(5.0), that is, their visual acuity is normal. In addition, children's development is different, and the vision standard can only be used as a reference, which should be judged by comprehensive optometry results. If the child's vision is lower than the lower limit of the normal vision of his peers, or the difference between his eyes is more than two lines, it means that his vision is abnormal.
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