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Related Experiment Video

Updated: Oct 20, 2025

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
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Interventions for intermittent exotropia.

Yi Pang1, Lawrence Gnanaraj2, Jessica Gayleard3

  • 1Optometry, Illinois College of Optometry, Chicago, IL, USA.

The Cochrane Database of Systematic Reviews
|September 13, 2021
PubMed
Summary
This summary is machine-generated.

Patching is effective for treating intermittent exotropia (X(T)) in children aged 1-10 years compared to observation. Other surgical and non-surgical treatments lack sufficient evidence for efficacy.

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Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Strabismus Management

Background:

  • Intermittent exotropia (X(T)) management lacks clear guidelines on intervention timing and effectiveness.
  • Optimal treatment strategies and criteria for X(T) remain debated in clinical practice.
  • Evidence-based recommendations for X(T) interventions are needed.

Purpose of the Study:

  • To review randomized controlled trials (RCTs) on surgical and non-surgical treatments for intermittent exotropia (X(T)).
  • To analyze treatment effects based on age and X(T) subtype.
  • To report intervention criteria and compare treatment efficacy.

Main Methods:

  • Systematic literature search of multiple databases (CENTRAL, MEDLINE, Embase, LILACS, ISRCTN, ClinicalTrials.gov, WHO ICTRP) up to January 2021.
  • Inclusion of RCTs evaluating any surgical or non-surgical treatment for X(T).
  • Standard Cochrane methodology for data collection and analysis, including meta-analysis where feasible.

Main Results:

  • Patching demonstrated clinical effectiveness in improving motor alignment for X(T) in children aged 1-10 years compared to active observation (high-certainty evidence).
  • Bilateral lateral rectus recession showed little difference in motor alignment and stereoacuity compared to unilateral recession with medial resection (moderate-certainty evidence).
  • Insufficient evidence exists for other interventions like prism adaptation tests or specific surgical techniques (e.g., lateral rectus recession with medial rectus plication).

Conclusions:

  • Patching is a beneficial treatment for basic or distance-type X(T) in young children (12 months to 10 years) compared to watchful waiting.
  • Current evidence is insufficient to support the efficacy of other surgical and non-surgical interventions for X(T).
  • Further high-quality RCTs are needed to clarify optimal treatment strategies for various X(T) subtypes and age groups.