Note for international readers: In Japan, municipalities conduct a mandatory pre-primary health screening — called the nyūgakuji kenshō (就学時健診) — for all children entering primary school the following year. Carried out under Article 11 of the School Health and Safety Act, it typically takes place in November or December, about six months before school entry. The examination covers nutritional status, the spine, thorax, vision, hearing, language, intellectual development, and psychological development. Approximately one million children go through this process each year. This article explains how to interpret the results.
Lead
When a follow-up notice arrives after the pre-school health screening, the words re-examination can bring a parent to a brief stop. "Is something wrong?" "Does this affect starting school?" The anxiety is natural — but understanding what a follow-up notice actually means changes how the same notice lands.
The pre-school health screening is a screening. Its purpose is not to confirm a diagnosis; it is to minimize missed findings. To do that, its detection threshold is set generously — which means healthy children are flagged at a predictable rate. Knowing that structure, and knowing what each flagged item is actually looking for, makes the notice much easier to navigate.
Legal Basis and Scope
The screening is conducted by municipalities under Article 11 of the School Health and Safety Act and targets children entering primary school the following year [1,2]. Japan's Ministry of Education guidelines specify the domains: nutritional status, spine, thorax, vision, hearing, language, intellectual development, and psychological development [2]. Physicians — general practitioners, ophthalmologists, and dentists — share the examination workload. The scale is approximately one million children per year [1].
Vision: What "Below 0.7" Means
The vision component uses a Landolt ring (C-shaped chart) with an eye-occluded method, typically with a cutoff of 0.7 uncorrected acuity in each eye. Around 4–6% of six-year-olds fall below this threshold in Japan's School Health Statistics data [1].
Two main reasons bring a child below the threshold at this age: refractive error: a defect in the eye's ability to focus light, including near-sightedness, far-sightedness, and astigmatism, correctable with lenses and amblyopia: reduced vision in one eye due to abnormal visual development in early childhood, often called "lazy eye," with a sensitive period closing around age 8.
Refractive error (near-sightedness, far-sightedness, or astigmatism) is correctable with lenses. Amblyopia, however, is different. Visual acuity development depends on visual experience in early life, and there is a "sensitive period" extending to roughly age eight after which the effect of treatment drops substantially [3]. One of the primary reasons vision is assessed at this pre-school screening is specifically to catch amblyopia before that sensitive period closes. If acuity is unmeasurable or strikingly low under the occluded test, an early ophthalmology appointment — before school entry — is the appropriate next step [3].
Hearing: Catching Otitis Media with Effusion
The hearing component uses pure-tone audiometry: a standardized hearing test presenting tones at specific frequencies and volumes to measure the quietest sounds a person can detect at 1,000 Hz and 4,000 Hz. The most commonly identified finding is OME: otitis media with effusion: fluid accumulating in the middle ear without signs of acute infection, often silent but capable of causing mild hearing loss (otitis media with effusion) — fluid accumulating in the middle ear without active infection, often without noticeable symptoms.
The prevalence of OME in children aged 3–8 years is reported at 15–20% [4]. It is the leading cause of hearing loss at school age. Given that even mild hearing reduction can affect language development and learning, finding it at a pre-school screening carries practical value: there is still time before the school year starts.
Most OME resolves within three months without treatment [4]. A follow-up notice about hearing is best used as a prompt to have the ears checked by an ENT physician between now and school entry — to confirm the current state and decide whether watchful waiting is appropriate.
Language and Developmental Assessment: What Screening Can and Cannot Tell You
The pre-school health screening uses standardized questionnaires and brief individual interviews — often conducted by an educational consultant — to form a broad impression of language, communication, and cognitive development. But these are brief screenings, not formal evaluations, and they cannot produce a clinical diagnosis.
Formal developmental assessment — using standardized developmental tests or cognitive measures — is conducted by specialized services: developmental support centers (hattatu shien sentā), pediatric neurology, or child psychiatry. When a screening flags "developmental concerns — consultation recommended," the usual next step is a referral to one of those services before school entry.
It is natural for parents to feel alarmed when a child is flagged in this category. Another way to frame it: a support pathway was identified before difficulties in the classroom forced the issue. When a school knows in advance what a child may need, it can prepare; what gets identified after school starts can mean the child has already struggled for months before help arrives.
What to Do With a Follow-Up Notice
The first question to answer is: which item triggered the follow-up? The appropriate action and urgency differ by category.
- Vision: Ophthalmology. If amblyopia is a possibility, go before school entry
- Hearing: ENT. OME is likely; timing depends on symptoms, but a pre-entry check is valuable
- Cardiac finding: Pediatrician or your primary care physician
- Language / developmental: Contact a developmental support center, or speak with your child's current pediatrician
When you attend the follow-up appointment, what helps most is: the Maternal and Child Health Handbook (boshi techo, which records development from birth), and any clinical notes from your pediatrician if available.
It is worth noting the child's state on the day of the original screening — whether they seemed anxious, tired, or had been in a noisy environment shortly before the hearing test. A brief note like that can be useful context when the follow-up appointment happens.
The pre-school health screening results form is retained by the school; copies do not automatically stay in the family's hands. Taking a photograph of the results to keep at home means you have a reference point when annual school health checkups begin — the start of a longitudinal record.
Summary
The pre-school health screening is not a mechanism for excluding children with problems. It is designed to minimize missed findings and connect children to appropriate support. A follow-up notice is a signal to take the next step — not a verdict.
What each item means differs. What the appropriate response is differs. The most reliable course of action after a follow-up notice is to identify the specific item, and then consult the relevant specialist.
References
- Ministry of Education, Culture, Sports, Science and Technology (Japan). School Health Statistics Survey. Various years. Available from: https://www.mext.go.jp/b_menu/toukei/chousa05/hoken/1268826.htm
- Ministry of Education, Culture, Sports, Science and Technology (Japan). Manual for School Entry Health Screening (revised edition). 2015. Available from: https://www.mext.go.jp/a_menu/kenko/hoken/1260350.htm
- American Academy of Pediatrics, Section on Ophthalmology; American Association for Pediatric Ophthalmology and Strabismus; American Academy of Ophthalmology; American Association of Certified Orthoptists. Visual system assessment in infants, children, and young adults by pediatricians. Pediatrics. 2016;137(1):e20153596. doi:10.1542/peds.2015-3596. PMID: 26644584.
- Rosenfeld RM, Shin JJ, Schwartz SR, et al. Clinical practice guideline: otitis media with effusion (update). Otolaryngol Head Neck Surg. 2016;154(1 Suppl):S1–S41. doi:10.1177/0194599815623467. PMID: 26832942.
- Matsuba CA, Jan JE, Freeman RD. Dense monocular congenital visual deprivation: a review of outcome. Arch Ophthalmol. 2006;124(12):1764–1767. doi:10.1001/archopht.124.12.1764. PMID: 17159037.
- Japan Pediatric Society, School Health Committee. School Health Examination Manual. 2019. Available from: https://www.jpeds.or.jp