A vision of 0.8 is not normal for an adult, but may be normal for a child whose vision is still developing. Normal vision for adults is 1.0 or better. Some children are younger and their eye axes have not yet developed to adult size, showing physiologic hyperopia, so 0.8 may be normal for a child. Usually around the age of 5, a child’s vision can approach the normal vision of an adult. Some children with developmental delays may have to be older to reach the 1.0 level, so 0.8 vision depends on the patient’s specific condition to decide whether it is normal or not. If an adult or a child over the age of 5 has 0.8 vision, it is necessary to go to the hospital for a detailed examination of what is causing the vision loss and then take appropriate treatment measures.