In terms of the relationship between accommodation and strabismus, hyperopia tends to cause internal strabismus and myopia tends to cause external strabismus. Good visual acuity is the basis of binocular vision. Different vision can cause strabismus and amblyopia, which can be seen as the close relationship between strabismus and amblyopia and refractive error. Therefore, correcting refractive error is the first step in the examination and treatment of strabismus in children. Wearing eyeglasses to correct refractive error is an important method to treat children’s strabismus. So why do we need to dilate the pupil before wearing glasses? Children’s eyes have a very strong ability to adjust, this ability is the ciliary muscle contraction within the eye, the lens protrudes convex process. If the eyes are in this state of optometry, the degree of ciliary muscle contraction changes every moment, and the result is inaccurate. After the application of dilated pupil medicine before the optometry so that the ciliary muscle is in a state of paralysis and relaxation, in order to measure the true degree. Some parents have some unnecessary concerns about pupil dilation, one is afraid of the pupil dilating agent is harmful to children. Secondly, they are afraid of delaying their children’s studies. Children with medication due to pupil dilation, regulation of paralysis, there will be a temporary fear of light, vision of near objects, etc., generally in the withdrawal of 2 to 3 weeks after the disappearance of the medication, in addition to reading, doing homework during this period of time, there are difficulties, it will not affect other activities. In addition, except for glaucoma, local application of atropine has no adverse effects on the eyes and the whole body and can be used repeatedly, parents do not have to worry. Of course, it should also be noted that in children with atropine pupil dilation should be pressed under the tear ducts, to prevent the drug into the tear ducts caused by poisoning. Atropine poisoning mild pediatric facial flushing, dry mouth, scratching, about 2 hours to improve, if the fever or more serious symptoms should be immediately informed to the doctor for timely treatment.