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Effect of late surgery for acquired esotropia on visual evoked potential
1Department of Ophthalmology, University of Szeged, Faculty of Medicine, Hungary.
Insights
Strabismus surgery in children over age 5 with acquired esotropia significantly improved visual evoked potential (VEP) amplitudes and binocular fusion. These positive changes occurred even beyond the typical critical period for visual development.
Area of Science:
- Ophthalmology
- Neuroscience
- Pediatric Vision
Background:
- Acquired esotropia in children can impact visual development.
- The critical period for visual plasticity typically closes by age 5.
- The potential for visual improvement after strabismus surgery in older children is an area of ongoing research.
Purpose of the Study:
- To evaluate the impact of strabismus surgery on visual evoked potential (VEP) amplitude in children aged 5 and older with acquired esotropia.
- To assess changes in binocular function following surgical correction.
Main Methods:
- 10 children (aged 5-6 years) with acquired esotropia underwent pattern reversal visual evoked potential (VEP) testing before and 3 months after strabismus surgery.
- Binocular and monocular VEPs were recorded.
- Binocular fusion was assessed using a synoptophore post-surgery.
- Correlation between electrophysiological and clinical outcomes was analyzed.
Main Results:
- A significant increase in pattern VEP amplitudes was observed post-surgery, particularly with binocular stimulation.
- Significant improvement in binocular fusion was also noted.
- Postoperative VEP changes did not consistently correlate with the degree of functional improvement.
Conclusions:
- Strabismus surgery can positively influence binocular VEPs and promote the development of binocular fusion in children with acquired esotropia, even when performed after the classical critical period.
- These findings suggest that visual plasticity may extend beyond traditional age limits for intervention.
Purpose:
To asses the effect of strabismus surgery on visual evoked potential (VEP) amplitude after age 5 years in children with acquired esotropia.
Methods:
Visual evoked potentials to binocular and monocular pattern reversal stimulation were recorded in 10 children aged 5 to 6 years before and 3 months after surgical correction of their esotropia. Visual function (fusion) was tested by synoptophore after strabismus surgery. Electrophysiological and clinical data were correlated following surgical intervention.
Results:
A significant increase in pattern VEP amplitudes was noted following strabismus surgery. Visual evoked potential changes were most prominent on binocular stimulation. Binocular fusion showed similarly significant improvement after intervention. Postoperative VEP data, however, were not consistently correlated with functional improvement.
Conclusion:
Surgical intervention in esotropia, even if performed years beyond the end of the classical critical period, can have a strong effect on binocular VEPs and a beneficial effect on the development of binocular fusion.