1, children’s visual acuity standards Generally speaking, the normal visual acuity of children aged 2-3 years is 0.5-0.6; normal visual acuity of children aged 3-4 years is 0.7-0.8; children aged 5-6 years should have a visual acuity of 1.0. 2, early detection of poor vision in children If you find that your child is always squinting, tilting his head, frowning or loves to look at things at close range when looking at things, you should take your child to the hospital for an eye examination as soon as possible. If it is refractive error, it is necessary to conduct dilated eye examinations under the guidance of a physician to accurately diagnose the nature and degree of refractive error, and then classify it for correction. 3, what is refractive error Refractive error is an optical defect that can only be treated through optical principles, that is, only through the wearing of appropriate glasses to achieve the purpose of controlling the development and gradual improvement. Children are in the stage of growth and development, its refractive error state will also develop with the development of the eye, so must adhere to every six months to review, under the guidance of ophthalmology professionals, according to the refractive state, pupil distance, etc. to replace the appropriate glasses, take the appropriate wearing method, in order to achieve the purpose of correction. 4, dilated vision Children’s prescription optometry must be dilated, because children’s eyes are very strong adjustment, this adjustment is a ciliary muscle contraction and lens convexity process, if in such a state of optometry, easy to adjust to cover the true refractive error, optometry results are inaccurate, with dilating agent, the ciliary muscle in a paralyzed relaxed state, the nature and degree of refractive error can be truly reflected The nature and degree of refractive error can only be truly reflected after the dilator is used and the ciliary muscle is paralyzed. In hospitals, the pupil is usually dilated with 1% atropine ophthalmic ointment.