A child’s vision of 0.25 usually indicates poor eyesight. If the visual acuity is only 0.25, the simple myopia may be more than 300 degrees, if it is farsighted, it is about 500 degrees, and astigmatism may also be 300-400 degrees, which means that children have obvious refractive error, more common is medium and high myopia. Myopia, hyperopia and astigmatism are all refractive errors and are the most common causes of vision loss in children. Congenital cataracts or transient edema of the eye, or problems with the fundus of the eye, can also affect a child’s vision, but the probability of such problems in children is relatively low. If a child has a visual acuity of 0.25, a routine visit to the ophthalmology department for a visual acuity check, followed by a slit lamp examination to observe the condition of the cornea, and then a fundus examination, will basically lead to a diagnosis. After children’s optometry, vision 0.25 is recommended to wear glasses. If children have more than 200 degrees of hyperopia or astigmatism, they may still have a certain degree of amblyopia even after wearing glasses, but the more amblyopia they have, the more they should wear glasses, and they should gradually cure amblyopia by continuing to wear glasses to provide clear vision.