For a seven year old child, under normal circumstances the naked eye vision should be 4.9 and above, so a naked eye vision of 4.9 is within the normal range. However, in this case, it is generally recommended to have regular vision checks, and it is usually recommended to take the child for a vision check every six months or so. If the vision improves gradually with the child’s age, for example, if it reaches 5.0, then it means that there is no problem with the development of the child’s eye vision. However, if with the growth of age, vision does not improve accordingly, but there is a decline in performance, it means that the child’s eyes may have problems, such as the existence of refractive error, you need to do an early optometric examination to clarify, if the vision is significantly lower than the normal range, we need to wear glasses early to improve vision, and in general to urge children to maintain a reasonable eye habits.