Vision & Hearing Screening

A first-grader who cannot see the board or hear the teacher is not a behavior problem — that child is a missed screening.

Vision and hearing screening are fundamental community health nursing functions performed in schools, pediatric clinics, and community settings. Vision screening: the Snellen chart (or Snellen E chart for preliterate children) is the standard tool. Normal visual acuity is 20/20. Referral criteria vary by age per AAPOS: 20/50 or worse for children aged 36-47 months, 20/40 or worse for children aged 48-59 months, and 20/32 or worse for children aged 5 and older. Screen at specific well-child visits per AAP/Bright Futures schedule (ages 3, 4, 5, and periodically in school-age years — not necessarily annually through all adolescence). The Ishihara test screens for color vision deficiency. In preschoolers, the HOTV matching test or LEA symbols may be used. Red flags that warrant immediate referral regardless of screening results include strabismus (misalignment of the eyes), nystagmus, asymmetric red reflex, and head tilting during visual tasks. Hearing screening: pure-tone audiometry is the standard. Screening frequencies are typically 1000, 2000, and 4000 Hz at 20 dB for children (some protocols include 500 Hz). Failure at any frequency in either ear warrants rescreening and possible referral to audiology. Otoacoustic emissions (OAE) and auditory brainstem response (ABR) are used for newborn hearing screening — all newborns should be screened before hospital discharge (EHDI: Early Hearing Detection and Intervention). Children who fail newborn screening need diagnostic audiologic evaluation by 3 months and enrollment in early intervention by 6 months (the 1-3-6 guideline). The community health nurse conducts screenings in a quiet environment, documents results, notifies parents of abnormal findings, and tracks referral completion.

Key Distinctions

Screening is not diagnostic. A child who fails a hearing screening does NOT have hearing loss — they need a diagnostic audiologic evaluation. Students confuse Snellen chart results: 20/40 means the child must be at 20 feet to see what a person with normal vision sees at 40 feet — the larger the second number, the worse the acuity. OAE and ABR are newborn screening methods, not tools for school-age children. Pure-tone audiometry requires the child to reliably respond to tones, so it is typically used starting at age 3-4.

Clinical Pearl

The 1-3-6 rule for newborn hearing: screened by 1 month, diagnosed by 3 months, in intervention by 6 months. If a parent says their newborn never had a hearing screen, that is the nurse's top priority referral.