Children’s eye sight is 0.2 and 0.5, depending on the age to determine whether the vision loss is serious. Under normal circumstances after birth vision is with age and gradually develop, generally 3 years of age or older can be vision examination, at this time the child’s vision should develop to about 0.6, to 4 years of age vision should develop to about 0.8, 5 years of age or older vision can be developed to 1.0. At present the child’s eyesight a 0.2 a 0.5, the difference between the vision of the two eyes is large, belong to the abnormality. However, if you need to determine the severity of the child’s vision, you will need to look at the child’s age to determine the extent of the difference from normal vision. If the child is old enough to have a visual acuity of 1.0 for a child of the same age, then the child’s condition is more serious. It is recommended that children with vision loss be seen promptly for an evaluation of their condition and treatment as prescribed by their doctor.