Paeds · ophthalmology
Refractive error in children
Also known as Myopia in children · Short-sightedness in children · Hyperopia in children · Long-sightedness in children · Astigmatism in children · Anisometropia · Refractive amblyopia · Myopia control
Fellowship topic on refractive error in children: the optical principle that refractive state is set by the balance between axial length and corneal and lenticular power, so that myopia focuses light in front of the retina, hyperopia behind it, and astigmatism at two focal lines; the classification of refractive errors into emmetropia, myopia (low, moderate and high), hyperopia, astigmatism (by axis) and anisometropia; the paediatric-specific point that uncorrected refractive error is the leading cause of preventable visual impairment in children and a major reversible cause of amblyopia, so that cycloplegic retinoscopy is the gold-standard refraction; the epidemiology of the global myopia epidemic and the risk factors of parental myopia, East Asian ethnicity, urban living, intense near work and limited outdoor time; the stepwise management of spectacle correction first, contact lenses and orthokeratology in older children, and low-dose atropine 0.01 to 0.05 percent for myopia control with outdoor time and reduced near work; the amblyopia risk-factor thresholds for hyperopia, astigmatism and anisometropia that drive prescribing and referral; and the red flags of reduced vision not improving with correction, a new squint or abnormal head posture, and a progressive rapid myopic shift.
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Target exams
Red flags
- Reduced vision that does not improve to age-normal levels with refractive correction in either eye — suspect amblyopia or pathology and refer for cycloplegic refraction and ophthalmology assessment
- A new or worsening squint, abnormal head posture or sudden aversion to near tasks in a previously normal child — refer urgently to exclude a refractive, motility or sight-threatening cause
- A rapid or progressive myopic shift, especially in a young child — may signal a transient refractive change of systemic disease such as poorly controlled diabetes, or a pathological cause, and needs ophthalmology review
- A child who fails vision screening at any age, or a known high-risk child (prematurity, family history, syndrome) who has not been refracted — uncorrected refractive error in the amblyopic age range must be corrected promptly to protect visual development
Life stages
Care settings
Clinical exam formats
Board mappings
- General Paediatrics and Ophthalmology: definition of refractive error (myopia, hyperopia, astigmatism, anisometropia), recognition of uncorrected refractive error as a leading preventable cause of visual impairment and amblyopia, and the role of cycloplegic refraction
- Growth and development: amblyopia risk-factor thresholds (significant hyperopia, astigmatism and anisometropia) and the vision-screening schedule from infancy to school age
- Renewed curriculum — Ophthalmology: cycloplegic retinoscopy as the gold standard, the global myopia epidemic and its risk factors, and the evidence base and thresholds for myopia control with low-dose atropine
- Population child health: school and community vision screening and equitable access to refraction and spectacles for rural and remote and disadvantaged families
- General Paediatrics: recognition of the child who fails vision screening or has visual difficulty, the stepwise management of refractive error, and the red flags for ophthalmology referral
- Psychosocial: the burden of uncorrected refractive error and the impact of myopia control on a school-age child and adolescent
- Long Case / Structured discussion: a child with progressive myopia, uncorrected hyperopia or astigmatism — diagnosis, cycloplegic refraction, stepwise management, amblyopia risk and the red flags
- Communication station: explaining to a family why a child needs glasses, the importance of wearing them, the role of outdoor time, and the reasoning behind low-dose atropine for myopia control
- Level 2 / 3 — Ophthalmology: recognition and stepwise management of childhood refractive error and its link to amblyopia
- Growth and development and health promotion: vision screening through childhood, the value of outdoor time, and the public-health dimension of the myopia epidemic
- Foundation of Practice (FOP): optics of refractive error, the amblyopia risk-factor thresholds, and the principles of vision screening
- Applied Knowledge in Practice (AKP): cycloplegic refraction, myopia-control options (atropine, orthokeratology, peripheral-defocus lenses) and the red flags for referral
- History-taking and management: the child who fails a vision screen or is struggling at school, including refraction, spectacles, myopia control and amblyopia prevention
- Communication: explaining the need for glasses, the reasoning behind low-dose atropine, and the reassurance and safety-netting around myopia control
- General Pediatrics Content Outline — refractive error: optics, amblyopia risk factors, vision screening and stepwise management
- Ophthalmology: myopia, hyperopia, astigmatism and anisometropia; cycloplegic refraction; myopia-control interventions
- Preventive pediatrics: the vision-screening schedule and the public-health response to the myopia epidemic
- Patient Care: recognition, refraction and stepwise management of childhood refractive error with amblyopia prevention
- Medical Knowledge: refractive optics, cycloplegic retinoscopy, the global myopia epidemic and the evidence base for low-dose atropine and orthokeratology
- Systems-Based Practice: school and community vision screening and equitable access to spectacles and myopia control
- Medical Expert: refractive error diagnosis, cycloplegic refraction and stepwise management across the myopia, hyperopia, astigmatism and anisometropia spectrum, with amblyopia risk assessment
- Health Advocate and Collaborator: coordinated ophthalmology and primary care for vision screening and the public-health response to the myopia epidemic
- Communicator: explaining the need for glasses, outdoor time and low-dose atropine to children and families
Where the light focuses — the three refractive errors
Myopia (short-sight)
Hyperopia (long-sight)
Hold one equation in mind: refractive state equals axial length set against corneal and lenticular power. Grow the eye too long and you get myopia (focus in front of the retina). Keep it too short and you get hyperopia (focus behind). Curve the cornea unevenly across its meridians and you get astigmatism (two focal lines). Make the two eyes differ and you get anisometropia (one eye out of step, the classic amblyopia driver). The eye then spends childhood adjusting, and the brain spends childhood deciding which image to keep — which is why timing matters: correct the error within the amblyopic age range or the visual system may never reach its potential. [2] [10]
Overview & Definition
Picture a seven-year-old who squints at the board and holds books to her nose, a four-year-old whose preschool screening flags a "refer" result, and a teenager whose myopia has jumped a dioptre in a year and whose parents ask whether anything can be done. Each is refractive error, and each is solved faster once you remember that the eye is an optical instrument whose focal power and eyeball length must match. [1] [12]
A refractive error exists when the optical components of the eye fail to focus parallel rays of light precisely on the retina. The four common types are myopia (excess optical power or, far more commonly, excessive axial length, focusing light in front of the retina), hyperopia (insufficient power or a short globe, focusing light behind the retina), astigmatism (unequal curvature of the cornea or lens producing two focal lines) and anisometropia (a difference in refractive error between the two eyes). When the eye focuses light exactly on the retina it is emmetropic. [2] [8]
The clinician's task has three layers. The first is recognition — identifying the child who cannot see clearly, fails a vision screen, or has a squint, eye strain or school difficulty. The second is accurate measurement under cycloplegia and a decision about whether and how much to prescribe, weighted by amblyopia risk. The third is definitive care — spectacles, contact lenses, myopia-control treatment and amblyopia prevention — balanced against the red flags that point to pathology rather than simple optics. Refractive error is common and usually benign, but in a child it is never merely a pair of glasses: it is a time-sensitive question about visual development. [10] [11]
References12ShowHide
- [1]Holden BA; Fricke TR; Wilson DA; Jong M; et al Global Prevalence of Myopia and High Myopia and Temporal Trends from 2000 through 2050. Ophthalmology, 2016.PMID 26875007
- [2]Flitcroft DI; He M; Jonas JB; et al IMI - Defining and Classifying Myopia: A Proposed Set of Standards for Clinical and Epidemiologic Studies. Invest Ophthalmol Vis Sci, 2019.PMID 30817826
- [3]Huang J; Wen D; Wang Q; McAlinden C; et al Efficacy Comparison of 16 Interventions for Myopia Control in Children: A Network Meta-analysis. Ophthalmology, 2016.PMID 26826749
- [4]Yam JC; Jiang Y; Tang SM; Law AKP; et al Low-Concentration Atropine for Myopia Progression (LAMP) Study: A Randomized, Double-Blinded, Placebo-Controlled Trial of 0.05%, 0.025%, and 0.01% Atropine Eye Drops in Myopia Control. Ophthalmology, 2019.PMID 30514630
- [5]Bullimore MA; Ritchey ER; Shah S; Leveziel N; et al The Risks and Benefits of Myopia Control. Ophthalmology, 2021.PMID 33961969
- [6]Chua WH; Balakrishnan V; Chan YH; et al Atropine for the treatment of childhood myopia. Ophthalmology, 2006.PMID 16996612
- [7]Vincent SJ; Cho P; Chan KY; et al CLEAR - Orthokeratology. Cont Lens Anterior Eye, 2021.PMID 33775379
- [8]Fozailoff A; Tarczy-Hornoch K; Cotter S; et al Prevalence of astigmatism in 6- to 72-month-old African American and Hispanic children: the Multi-ethnic Pediatric Eye Disease Study. Ophthalmology, 2011.PMID 20888047
- [9]Afsari S; Rose KA; Gole GA; et al Prevalence of anisometropia and its association with refractive error and amblyopia in preschool children. Br J Ophthalmol, 2013.PMID 23613508
- [10]Holmes JM; Clarke MP Amblyopia. Lancet, 2006.PMID 16631913
- [11]Kapoor V; Magoon S; Kaur S; et al Community based vision screening in preschool children; performance of the Spot Vision Screener and optotype testing. Ophthalmic Epidemiol, 2022.PMID 34423736
- [12]Németh J, Tapasztó B, Aclimandos WA, et al. Update and guidance on management of myopia. European Society of Ophthalmology in cooperation with International Myopia Institute. Eur J Ophthalmol, 2021.PMID 33673740