A 4-year-old child has right esotropia of 30 prism diopters for distance and near fixation. Cycloplegic refraction shows +4.0 D sphere bilaterally. With full refractive correction, the esotropia is fully eliminated. Which TYPE of esotropia is this, and what is the underlying mechanism?

• A Basic esotropia; high AC/A ratio with excessive convergence for distance
• B Fully accommodative esotropia; excessive accommodative convergence driven by uncorrected hypermetropia ✓
• C Convergence excess esotropia; excessive near convergence with normal distance alignment
• D Non-accommodative esotropia; structural lateral rectus weakness

Explanation

Fully accommodative esotropia occurs in children with significant uncorrected hypermetropia (+2.0 D or more). To focus on a near or distance target, the child exerts excessive accommodation. Accommodation and convergence are physiologically linked (synkinetic reflex) — excessive accommodation drives excessive convergence (high accommodative convergence), causing esotropia. Full spectacle correction neutralizes the accommodative drive; esotropia resolves completely. Incomplete correction or residual deviation after glasses indicates a partially accommodative or mixed component.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.