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VECP evidence for binocular function in infantile esotropia
1Department of Ophthalmology, University of Wisconsin School of Medicine, Madison.
Insights
Early detection of binocular vision using visually evoked cortical potential (VECP) is crucial. Timely treatment for infantile esotropia before age 2 can restore nonlinear binocular responses in children.
Area of Science:
- Neuroscience
- Ophthalmology
- Developmental Biology
Background:
- Traditional clinical methods for assessing binocular function in young children are subjective and limited.
- Visually evoked cortical potential (VECP) offers an objective, clinically practical method for evaluating binocularity in infants.
- Infantile esotropia is a condition affecting binocular vision development.
Observation:
- A study involved 14 infants and young children (4-44 months) with infantile esotropia and 25 normal infants as controls.
- Normal infants developed 'beat' VECP by 2 months and 'sum' VECP by 6 months.
- Esotropic infants under 1 year often lacked both 'sum' and 'beat' VECP responses.
Findings:
- Children with infantile esotropia treated before age 2 showed restored 'sum' VECP, with some developing 'beat' VECP.
- Esotropic patients treated after age 2 had limited recovery of VECP responses.
- A loss of nonlinear binocular response is suggested in esotropic children if not corrected by age 2.
Implications:
- Early surgical correction of infantile esotropia (before 2 years) appears critical for restoring nonlinear binocular responses.
- VECP is a valuable tool for objectively assessing binocular function development in infants.
- Prompt intervention may enable recovery of visual processing capabilities lost due to esotropia.
Abstract:
Since commonly used clinical methods of measuring binocular function require subjective responses, this testing has been limited to more cooperative children, usually older than 2 years of age. Recently, we have begun using a clinically practical, visually evoked cortical potential (VECP) method to detect the presence of binocular neurons in infants and young children. We studied 14 children, ages 4 to 44 months, with infantile esotropia. Nine had surgical correction for esotropia by the age of 2 years. Twenty-five normal infants ages 6 weeks to 22 months served as controls. Most normal infants showed the development of the "beat" by 2 months of age. The "sum" VECP was not consistently present until age 6 months. Four of the five esotropic infants less than 1 year of age, demonstrated neither a "sum" nor "beat" response. All nine patients with corrective surgery performed before 2 years of age developed a significant sum response and three developed a beat. Five patients had not had surgery until after 2 years of age. Two developed a sum and one a beat, but none had both beat and sum responses. The results suggest that there is a loss of nonlinear binocular response in esotropic children not corrected before the age of 2 years and that these responses can be restored after early treatment even if not present at the time of surgery.