A 4-year-old with accommodative esotropia and poor glasses wear
A 4-year-old boy is referred by his health visitor because his left eye turns in. He has had glasses for 6 months (+4.50 DS right, +4.75 DS left) but his mother says he rarely wears them. Visual acuity with glasses: right 6/6, left 6/24; cycloplegic refraction +4.75/+5.00. Cover test shows a left esotropia of 30 prism dioptres at distance and near with no change on accommodation; there is no stereopsis on the Frisby test. Fundus and media are normal. He has no developmental delay. His parents are concerned about surgery and ask whether glasses alone will fix it.
1. What is your diagnosis and first-line management, and how do you address the parents' question?
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Diagnosis: accommodative esotropia with left amblyopia.
- The esotropia is 30 PD at distance and near, and he is significantly hypermetropic (+4.75/+5.00). The first step is full cycloplegic correction, not surgery.
- His mother says he rarely wears the glasses, which explains the persistent amblyopia and esotropia. Compliance is the key issue.
- Amblyopia therapy: part-time patching of the right eye for 2-4 hours per day, or atropine 1% penalisation, with review every 6-8 weeks.
Counselling:
- If the esotropia is fully accommodative, glasses alone will straighten the eyes.
- Surgery is only for the residual constant component after an adequate trial of glasses.
- Untreated amblyopia, not the turn, is the main threat to vision, so glasses and patching come first.
2. At review 8 weeks later, with glasses worn 10 hours a day, the esotropia is 10 PD at distance and near and visual acuity is 6/12 in the left eye. What now?
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This is a partial accommodative esotropia; the glasses are working.
- Continue full-time wear and continue amblyopia therapy.
- Consider bifocal glasses if the esotropia is greater at near than distance, or if there is a high accommodative convergence/accommodation ratio.
- Do not operate while there is residual amblyopia and the angle is still reducing; re-refract after 6 months of consistent wear.
- If the residual esotropia remains greater than 10 PD and is stable with good compliance and best-corrected acuity, plan surgery (bilateral medial rectus recession).
3. What factors would make you operate earlier rather than later?
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Factors prompting earlier surgery:
- A constant, large-angle esotropia that does not reduce with full-time glasses after 6-8 weeks.
- Deteriorating or non-responsive amblyopia despite good compliance, or inability to comply with glasses or patching.
- Loss of binocular potential (older age at presentation, no stereopsis).
- A significant residual angle after an adequate trial of glasses (usually 3-6 months); surgery before school age improves binocular outcomes.
Conversely, if the angle is intermittent or fully controlled with glasses, continue conservative management.