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Area of Science:

  • Ophthalmology
  • Vision Science

Background:

  • Intermittent exotropia (IXT) is a common strabismus condition.
  • Surgical correction of IXT aims to improve eye alignment.
  • The impact of IXT surgery on contrast sensitivity (CS) requires further investigation.

Purpose of the Study:

  • To evaluate the effect of IXT surgery on monocular and binocular contrast sensitivity (CS).
  • To assess changes in the binocular summation ratio (BSR) after IXT surgery.
  • To determine the short-term and long-term recovery of CS post-IXT surgery.

Main Methods:

  • Retrospective study of 64 patients undergoing IXT-correcting surgery.
  • Pre- and postoperative Mars CS test scores were analyzed.
  • Monocular, binocular CS, and BSR were compared at different postoperative time points.

Main Results:

  • Postoperative day 1 showed significantly worse monocular and binocular CS scores in operated eyes, which recovered by 1 week.
  • Monocular CS scores of operated eyes were worse than non-operated eyes for up to 1 week.
  • Binocular summation ratio (BSR) decreased at 1 month but returned to preoperative levels by 3 months.

Conclusions:

  • IXT surgery can cause a temporary decline in contrast sensitivity.
  • Contrast sensitivity typically recovers to preoperative levels within weeks to months.
  • Immediate postoperative CS changes after strabismus surgery are generally not a clinical concern.