The vision standard for four-year-olds is mostly around 0.7-0.8, which means that if a four-year-old child’s vision is significantly lower than this standard, or if the difference in vision between the two eyes is more than two lines, it needs to be taken seriously, mostly due to myopia or high farsightedness or astigmatism. In this case, it is necessary to go to the hospital for optometry, especially the use of atropine slow dilated pupil optometry, in order to get a more accurate prescription. It takes three days of atropine and a fourth day of optometry, but it takes about three weeks for the pupil to recover to its previous size. After three weeks, a final prescription will be performed, and glasses will be prescribed to correct the prescription according to the prescription. If you are nearsighted, your vision can be improved with glasses. In the case of high hyperopia or high astigmatism, it is likely that amblyopia will be combined with glasses and may require masking therapy or fine training to correct the amblyopia.