Best age for surgery for infantile esotropia

Area of Science:

• Ophthalmology
• Pediatric Ophthalmology
• Strabismus Research

Background:

• Infantile esotropia (IE) is a significant visual impairment in infants, characterized by early-onset strabismus and potential long-term effects on binocular vision.
• Risk factors for IE include prematurity, low birth weight, and low Apgar scores, necessitating careful consideration of treatment timing.
• Current surgical timing for IE varies globally, with the US favoring 12-18 months and Europe recommending 2-3 years.

Purpose of the Study:

• To evaluate the impact of early versus late surgical intervention on visual outcomes and reoperation rates in infantile esotropia.
• To analyze the long-term effects of surgical timing on stereopsis, strabismus stability, and the need for subsequent procedures.
• To propose a refined definition of IE based on its underlying causes and similarities with other neurodevelopmental disorders.

Main Methods:

• Prospective evaluation of early- versus late-surgery groups within the European Early vs. Late Infantile Strabismus Surgery Study (ELISSS).
• Meta-regression analysis combining ELISSS data with 12 other studies to assess reoperation rates based on age at first surgery.
• Analysis of endpoints including binocular vision, strabismus angle stability, and number of operations required.

Main Results:

• Children operated later (around 49 months) demonstrated significantly better gross stereopsis at age 6 compared to those operated earlier (around 20 months) (3.9% vs. 13.5%).
• Reoperation rates were substantially higher for children first operated around age 1 (60-80%) compared to those operated around age 4 (25%).
• A notable percentage of children in the early surgery group (20%) and late surgery group (8%) had not undergone surgery by age 6, with many experiencing spontaneous angle decrease.

Conclusions:

• Delayed surgical intervention in infantile esotropia may offer improved visual outcomes and reduced reoperation rates.
• The optimal age for IE surgery should consider individual factors such as visual recovery, angle stability, and the likelihood of spontaneous regression.
• A more precise classification of IE based on etiology is crucial for understanding and improving surgical outcomes, potentially by adapting definitions used for cerebral palsy.