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Dramatic Decrease in Ocular Deviation 1 Day before Surgery in Patients with Intermittent Exotropia.

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A small group of intermittent exotropia patients showed reduced eye deviation before surgery, indicating better control. The monocular occlusion test confirmed their largest deviation angles.

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Area of Science:

  • Ophthalmology
  • Strabismus Research
  • Pediatric Eye Care

Background:

  • Intermittent exotropia is a common strabismus affecting binocular vision.
  • Pre-surgical assessment is crucial for planning effective surgical correction.
  • Variability in ocular deviation can complicate surgical timing and outcomes.

Purpose of the Study:

  • To investigate the clinical characteristics of intermittent exotropia patients with a significant reduction in eye deviation just before surgery.
  • To understand the implications of this pre-operative deviation decrease on surgical planning and outcomes.

Main Methods:

  • Retrospective analysis of intermittent exotropia patients undergoing surgery (December 2013 - December 2019).
  • Inclusion criteria: ≥10 prism diopters (PD) decrease in ocular alignment 1 day before surgery compared to the maximum previous angle.
  • Monocular occlusion test used to re-confirm the largest ocular deviation angle.

Main Results:

  • Ten patients (6 females, mean age 8.6 years) met the criteria.
  • Mean largest deviation: 31.0 PD (distance), 34.5 PD (near).
  • Mean post-reduction deviation: 7.4 PD (distance), 6.2 PD (near).
  • All patients proceeded to surgery without postoperative overcorrection.

Conclusions:

  • A subset of intermittent exotropia patients exhibits reduced deviation pre-surgery, suggesting improved alignment control.
  • The monocular occlusion test is valuable for accurately assessing the maximum deviation in these cases.
  • This pre-operative decrease did not negatively impact surgical outcomes.