5 years old is normal?

Vision refers to the ability of retina to distinguish images. Vision is judged by the size of retina's ability to distinguish images. However, when the refractive medium of the eye such as cornea, lens, vitreous body becomes turbid or there is refractive error including myopia, hyperopia, astigmatism, etc., even if the retina functions well, the vision will still decline. Vision includes central vision and peripheral vision. We usually refer to distance vision and central vision. It reflects the function of the most sensitive part of the retina, namely the macular area.Five-year-old children's vision is generally 0.8 or above, some children can reach 1.0 vision, if the vision is lower than 1.0, need to do mydriatic refraction with his diopter to determine whether vision is abnormal.