When to Prescribe Glasses in Children: AAO Thresholds by Age
Last updated: October 2026
When does a young child's cycloplegic refraction need glasses? The AAO thresholds below are a consensus starting point. Lower them when there is strabismus, amblyopia, symptoms or poor visual behaviour.
AAO guidelines for refractive correction in infants and young children
| Condition (cycloplegic refraction) | Under 1 year | 1 to under 2 years | 2 to under 3 years | 3 to under 4 years |
|---|---|---|---|---|
| Isoametropia (similar in both eyes) | ||||
| Myopia | 5.00 D or more | 4.00 D or more | 3.00 D or more | 2.50 D or more |
| Hyperopia, no manifest deviation | 6.00 D or more | 5.00 D or more | 4.50 D or more | 3.50 D or more |
| Hyperopia with esotropia | 2.00 D or more | 2.00 D or more | 1.50 D or more | 1.50 D or more |
| Astigmatism | 3.00 D or more | 2.50 D or more | 2.00 D or more | 1.50 D or more |
| Anisometropia (difference between eyes, without strabismus) | ||||
| Myopia | 4.00 D or more | 3.00 D or more | 3.00 D or more | 2.50 D or more |
| Hyperopia | 2.50 D or more | 2.00 D or more | 1.50 D or more | 1.50 D or more |
| Astigmatism | 2.50 D or more | 2.00 D or more | 2.00 D or more | 1.50 D or more |
From the AAO Pediatric Eye Evaluations Preferred Practice Pattern. Values are based on expert consensus, not trial data. With strabismus, use lower anisometropia thresholds. Over 4 years of age, prescribe according to acuity, symptoms and amblyopia risk.
How much to prescribe
- Accommodative esotropia: give the full cycloplegic hyperopic correction. Add bifocals (+2.50 to +3.00 D executive or flat-top) if there is a residual near deviation (high AC/A).
- Hyperopia without esotropia: many clinicians cut the plus symmetrically by about 1–1.5 D (or about a third) to help acceptance, but never cut the anisometropic difference.
- Myopia: give the full correction; avoid undercorrection, which does not slow progression. See myopia control.
- Astigmatism: prescribe the full cylinder at the measured axis.
- Anisometropia: correct the full difference; children adapt well to aniseikonia.
- Review about 6–8 weeks after the first glasses for acuity, alignment and amblyopia; then start occlusion if acuity plateaus. See amblyopia treatment.
Cycloplegic drops by age
| Age | Usual regimen | Notes |
|---|---|---|
| Under about 6–12 months (and preterm infants) | Cyclopentolate 0.5% (with phenylephrine 1–2.5% if needed for dilation) | Avoid phenylephrine 10% in infants. Press on the lacrimal sac to reduce systemic absorption. Watch for feeding intolerance in neonates. |
| Children over 1 year | Cyclopentolate 1%: 1 drop, repeated after 5–10 minutes; refract after 30–45 minutes | Add tropicamide 1% or an extra cyclopentolate drop in darkly pigmented irides |
| Suspected accommodative esotropia with residual accommodation, or very dark irides | Atropine 1% (0.5% in young children), twice daily for about 3 days before the visit (not on the day) | Warn about fever, flushing and dry mouth. Stop if signs of toxicity. |
Cyclopentolate toxicity (more likely with 2% drops, low body weight, or Down syndrome): restlessness, hallucinations, ataxia and tachycardia, usually within an hour. Most cases settle with observation; refer to paediatrics if severe.
Related: amblyopia classification, children's eye check-ups and the strabismus measurement card.
Key sources
- AAO: Guidelines for refractive correction in infants and young children (Pediatric Eye Evaluations PPP table)
- AAO Preferred Practice Pattern: Amblyopia and Esotropia and Exotropia (current editions)
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