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Cycloplegic refraction and retinoscopy

  • Examination

Drops that relax focusing reveal a child's true refraction. Without them, long sight is missed and glasses are prescribed wrong.

Updated

See it in 3D: Ciliary body · Lens

What it is

Cycloplegic drops block the ciliary muscle, stopping accommodation and dilating the pupil. In children, whose accommodation is strong, this reveals the true refractive error, especially hyperopia. The refraction is then measured objectively by retinoscopy (watching the light reflex from the retina while placing lenses) or with an autorefractor. Colombian guidelines recommend that every child's refraction be measured under cycloplegia.

Normal values and scales

  • Cyclopentolate: standard agent, effect for about a day.
  • Atropine: strongest and longest (up to one to two weeks), used selectively.
  • Tropicamide: short and weak; used in infants under 6 months.
  • Systemic effects (flushing, fever, fast heart rate, agitation) are more likely in infants and small children.

How it is done

  1. Check the history for allergies, heart disease, seizures and previous reactions to drops.
  2. Instil the cycloplegic for the age: cyclopentolate usually; tropicamide under 6 months or if others are contraindicated; atropine in some esotropias.
  3. Press on the inner corner of the lids for a minute to reduce absorption into the body.
  4. Wait for full effect (usually 30 to 45 minutes for cyclopentolate).
  5. Perform retinoscopy or autorefraction and record sphere, cylinder and axis.
  6. Warn the family about blurred vision and light sensitivity for several hours (longer with atropine).

How to interpret it

  • Accommodative esotropia is diagnosed by finding hyperopia under cycloplegia.
  • Darkly pigmented irides may need more drops or a stronger agent.
  • The same drops are used to treat amblyopia (atropine penalisation) and to relieve pain in uveitis.

Next step / Initial management

  • Prescribe glasses according to age, acuity, size of the error, strabismus and symptoms (Colombian guideline table).
  • Systemic reaction to drops: stop, observe, and treat symptoms; note the reaction in the record.
  • Child with strabismus or amblyopia: cycloplegic refraction is part of the first exam.
  • Review glasses 4 to 6 weeks after prescription.

Test yourself

Think of the answer, then tap the question to see it.

Why do children need cycloplegia for refraction?

Because their strong accommodation hides hyperopia; blocking it reveals the true refractive error.

Which cycloplegic is used in infants under 6 months according to the Colombian guideline?

Tropicamide.

How can systemic absorption of eye drops be reduced?

By pressing on the inner corner of the lids (over the tear duct) for about a minute after instilling them.

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Connections

See it in 3D2

The structures of Durgical's 3D anatomy where it is found.

In Pharmacology4

← All of ophthalmology

Educational content; not a clinical guideline and no substitute for assessment by a health professional. For sudden visual loss, severe eye pain, a chemical burn or an eye injury, go to an emergency department at once.

Sources: Cycloplegic and Noncycloplegic Refraction (StatPearls Publishing (NCBI Bookshelf), 2023); Objective Refraction Technique: Retinoscopy (StatPearls Publishing (NCBI Bookshelf), 2023); Guía de práctica clínica para la detección temprana, el diagnóstico, el tratamiento y el seguimiento de los defectos refractivos en menores de 18 años (Guía No. 47) (Ministerio de Salud y Protección Social de Colombia, 2016).

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Representative model, for educational purposes only.