Variability of strabismus surgery for acquired esotropia

Area of Science:

• Ophthalmology
• Pediatric Ophthalmology
• Surgical Outcomes

Background:

• Acquired esotropia in children can significantly impact visual development.
• Accurate surgical correction is crucial for successful visual outcomes.
• Predictive models can help manage expectations for surgical success rates.

Purpose of the Study:

• To develop a mathematical model for predicting the success rate of initial surgery for acquired esotropia in children with a normal accommodative convergence-accommodation ratio.
• To assess the impact of surgical performance and measurement errors on predicted surgical outcomes.

Main Methods:

• A computer-averaged dose-response curve was generated from data on 68 bilateral medial rectus recessions.
• The model incorporated various assumptions regarding potential errors in surgical execution and preoperative deviation measurements.
• Fifteen distinct sets of assumptions were analyzed to determine a range of theoretical success rates.

Main Results:

• The developed mathematical model predicted a range of theoretical success rates from 72% to 96% for the first surgery.
• The study highlights that a proportion of surgical failures are anticipated even with optimal surgical technique.
• Variability in surgical performance and measurement accuracy influences the predicted success rate.

Conclusions:

• Mathematical modeling provides valuable insights into the expected success rates of strabismus surgery.
• Surgical outcomes for acquired esotropia are influenced by inherent variabilities in surgical procedures.
• Even highly competent ophthalmic surgeons should anticipate a certain rate of surgical failure in strabismus correction.