Cycloplegic Refraction and Refracting Children: Drugs, Technique and Prescribing
Last updated: November 2026
RPC Rounds for Optometrists · B.Optom study guide
Children accommodate strongly, so a dry (non-cycloplegic) refraction often underestimates hyperopia and overestimates myopia. Cycloplegic refraction is the standard for a child's first eye examination, for any squint or amblyopia, and whenever the findings do not add up.
When to use cycloplegia
- First full eye examination in young children (especially under about 8–10 years).
- Any strabismus, especially esotropia (accommodative component), and suspected amblyopia.
- Unexplained reduced vision, fluctuating retinoscopy, or suspected latent hyperopia in older children and young adults with asthenopia.
- Before refractive surgery in young adults.
Cycloplegic drugs
| Drug | Typical use | Onset and peak | Recovery | Notes |
|---|---|---|---|---|
| Cyclopentolate 1% (0.5% under 1 year) | Standard cycloplegic for most children | Refract 30–45 minutes after the last drop | About 24 hours | 1 drop, repeated after 5–10 minutes; avoid 1% in neonates; can cause transient drowsiness, flushing, hallucinations (CNS toxicity) |
| Atropine 1% (0.5% in young children) | Maximum cycloplegia: high hyperopia, esotropia, very dark irides when cyclopentolate is insufficient | Full effect after 3 days of use | 7–14 days | Ointment preferred; warn about fever, flushing, dry mouth; press on the lacrimal sac to reduce systemic absorption |
| Tropicamide 1% | Mainly a mydriatic; weak cycloplegia | 20–30 minutes | 4–6 hours | Not reliable for full cycloplegia in children; useful in adults and for dilation |
| Homatropine 2% | Uveitis and older use | About 1 hour | 1–3 days | Rarely used for refraction now |
Darkly pigmented irides (common in India) respond more slowly: allow the full time, and consider a second drop. A topical anaesthetic first reduces stinging and improves penetration. Ask about seizures, heart disease, Down syndrome and previous drug reactions.
Retinoscopy in children
- Use a fixation target the child likes (cartoon video or light) along the visual axis at distance; keep your working distance constant (for example 50 cm, so subtract 2.00 D, or 67 cm, subtract 1.50 D).
- Use loose lenses or a lens rack instead of a trial frame for young children; work quickly.
- Under cycloplegia a centrally dilated pupil can give peripheral aberrations: concentrate on the central reflex.
- Check both meridians and confirm astigmatism axis carefully; obliquely viewed reflexes are common errors.
Prescribing for children (guide)
Prescribe what will help vision, comfort and binocular development, not every dioptre found. The AAO Pediatric Eye Evaluations Preferred Practice Pattern gives consensus thresholds by age; for example, in children aged 1–2 years without squint consider glasses for hyperopia of about +5.00 D or more, myopia of about −4.00 D or more, astigmatism of about 2.50 D or more, and anisometropia of about 2.50 D (hyperopia), 2.50 D (astigmatism) or 3.00 D (myopia) or more. Thresholds fall as the child gets older and are lower if there is squint. See paediatric glasses prescribing for the full table.
- Esotropia: prescribe the full cycloplegic hyperopia.
- Exotropia: consider undercorrecting hyperopia, and full correction of myopia.
- Hyperopia without squint: commonly reduce the cycloplegic sphere by about 1.00 D (or a third), balancing both eyes equally.
- Myopia: full correction of the least minus for best acuity; discuss myopia control.
- Review after 6–12 weeks of full-time wear (refractive adaptation), and then every 6–12 months.
Practical pearls
- A child who fights the glasses is often overcorrected in myopia or undercorrected in esotropia: recheck the cycloplegic refraction.
- Tell parents in advance that the pupils will stay big and near vision blurred for a day after cyclopentolate, and for up to 2 weeks after atropine.
- Always do a fundus examination while the pupils are dilated: it is the best chance in a young child.
Where students slip
- Relying on a dry autorefraction in a 5-year-old with headaches.
- Refracting before the cyclopentolate has had 30 minutes to work, especially in dark irides.
- Prescribing the full cycloplegic hyperopia to a child with exotropia.
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Related: When to Prescribe Glasses in Children: AAO Thresholds by Age, Retinoscopy Tips: With vs Against Movement and Working Distance, When Should My Child Have an Eye Test? Age-by-Age Guide, Amblyopia: Classification, Severity and PEDIG Treatment Lessons, Esotropia and Exotropia: Types, Tests and Surgery. Back to the optometry curriculum.
Key sources
- American Academy of Ophthalmology. Pediatric Eye Evaluations Preferred Practice Pattern (current edition)
- Wright KW, Strube YNJ. Pediatric Ophthalmology and Strabismus. 3rd ed. Oxford University Press; 2012
- Elliott DB. Clinical Procedures in Primary Eye Care. 5th ed. Elsevier; 2020
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