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[Symmetric or asymmetric surgery for basic intermittent exotropia]

D Yuksel1, M Spiritus, S Vandelannoitte

  • 1Service d'Ophtalmologie UCL, Bruxelles.

Bulletin De La Societe Belge D'Ophtalmologie
|November 12, 1998
PubMed
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Symmetrical and asymmetrical surgery for intermittent exotropia showed similar long-term alignment outcomes in young patients. While asymmetrical procedures appeared to yield better immediate results, both surgical approaches ultimately provided comparable success rates for strabismus correction.

Area of Science:

  • Ophthalmology
  • Strabismus Surgery
  • Pediatric Ophthalmology

Background:

  • Intermittent exotropia is a common form of strabismus in children.
  • Surgical correction is often necessary to improve binocular vision and alignment.
  • The choice between symmetrical and asymmetrical surgical techniques is a subject of ongoing clinical debate.

Purpose of the Study:

  • To compare the long-term surgical outcomes of symmetrical (bilateral lateral rectus recessions) versus asymmetrical (unilateral recess-resect) procedures for basic intermittent exotropia in young patients.
  • To evaluate the impact of surgical approach on immediate and final postoperative alignment, sensory fusion, and stereopsis.

Main Methods:

  • Retrospective analysis of 55 young patients with basic intermittent exotropia undergoing initial surgery.

Related Experiment Videos

  • Group 1: 25 patients with unilateral recess-resect surgery.
  • Group 2: 30 patients with bilateral lateral rectus recessions.
  • Preoperative and postoperative assessment of alignment (prism cover test), sensory fusion (Bagolini, Worth test), and stereopsis (TNO, Lang test).

    • Main Results:

    • No statistically significant difference in immediate postoperative overcorrection between the groups (53% overall).
    • Long-term follow-up (average 2.81 years) showed similar outcomes: 53% achieved good/fair alignment, 42% had residual exotropia, and 5% were overcorrected.
    • No significant difference in long-term alignment success rates between symmetrical and asymmetrical surgical groups (p = 0.512).

    Conclusions:

    • Both symmetrical and asymmetrical surgical techniques are effective for correcting basic intermittent exotropia in the long term.
    • Immediate postoperative results may favor asymmetrical surgery, but this difference does not persist over time.
    • The choice of surgical technique does not significantly impact long-term strabismus alignment outcomes.