Preventive vision care.
D000065:Accommodation, Ocular; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D005139:Eyeglasses; D006801:Humans; D011932:Reading; D012029:Refraction, Ocular; D014786:Vision Disorders / Q000517:prevention & control*; D014792:Visual Acuity