Developmental Screening in Children

Visual Acuity Testing

Traditional visual acuity testing should be performed using age-appropriate optotypes, with children who are untestable rescreened within 6 months or referred, as recommended by the American Academy of Ophthalmology 1
Visual acuity screening should begin at 3 years of age, with instrument-based screening potentially starting earlier at 12 months of age, according to the American Academy of Ophthalmology 1
For children 3-5 years, traditional visual acuity testing should begin with age-appropriate optotypes (LEA SYMBOLS or HOTV letters) and a passing threshold of 20/40 or better 2, 1
For children 6 years and older, visual acuity testing should continue with a stricter passing threshold of 20/30 or better and use Sloan letters as the preferred optotypes 1
Each eye should be tested separately with proper occlusion, and a line of figures rather than single optotypes should be used, with a testing distance of 10 feet for children 2, 1
Children under 6 years should be referred if visual acuity is less than 20/40 in either eye, and children 6 years and older should be referred if visual acuity is less than 20/30 in either eye 2, 1
Any two-line difference between eyes, even within the passing range, warrants referral, and children who are untestable should be rescreened within 6 months or referred 2, 1

A standardized developmental screening tool should be used at 4 years of age, with parent-completed tools, such as Parents' Evaluation of Developmental Status or Ages and Stages Questionnaire, being preferred over directly administered tools, as recommended by the American Academy of Family Physicians 3
Assessment should include gross and fine motor skills, language development, social-emotional development, and cognitive abilities, as suggested by the American Academy of Pediatrics 4

Audiometric screening is recommended at 4 years, and should be performed in a quiet environment using age-appropriate methods, according to the American Academy of Pediatrics 5, 6

Screen for behavioral concerns, mood problems, and social development, as recommended by the American Academy of Pediatrics 4
Assessment of adaptive functioning, including daily living skills, is also recommended, as suggested by the American College of Medical Genetics and Genomics 7

Relying solely on clinical observation without standardized screening tools significantly reduces detection of developmental delays, and validated screening tools improve identification of children needing further evaluation, according to the American Academy of Family Physicians 3
The American Academy of Pediatrics recommends targeted screening for healthy children based on individual needs, rather than routine laboratory screening, to avoid unnecessary tests and costs 8
Ordering routine labs without specific indications can lead to false positives, unnecessary follow-up testing, and increased healthcare costs 8
Laboratory values in children have different reference ranges than adults, and misinterpretation can lead to unnecessary interventions 8
Missing appropriate targeted screening based on risk factors or symptoms can delay diagnosis of important conditions 8
Delaying initial screening can miss critical treatment windows for amblyopia and other vision disorders, and using inappropriate testing methods or inadequate occlusion can invalidate results 1, 9

Children with chronic cough (≥4 weeks) should undergo a chest radiograph and spirometry (when appropriate) 8
Children with 22q11.2 deletion syndrome may need yearly complete blood counts 7
Children with sickle cell disease (2-16 years) require specific screening protocols 10
Children with juvenile idiopathic arthritis on medications require specific monitoring 11
Screening for sexually transmitted infections is not applicable to children unless there are specific concerns 12

Early detection and treatment of visual impairment is critical for preventing permanent visual loss from amblyopia, reducing lifelong risk of bilateral vision impairment, and improving educational achievement, sports participation, psychosocial well-being, and occupational selection 2, 1
Normal vision is considered better than 20/60, with moderate visual impairment beginning at visual acuity less than 20/60 (including 20/70) 13
Visual acuity measurements of 20/25 and 20/30 are considered well within normal limits, indicating no need for medical intervention 13