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Development of accommodation and convergence in infancy
L Hainline1, P Riddell, J Grose-Fifer
1Infant Study Center, Brooklyn College, City University of New York 11210.
Behavioural Brain Research
|July 31, 1992
Summary
Infant visual development shows appropriate eye-teaming (convergence) early on, but focusing ability (accommodation) matures later. Early focusing errors can mimic myopia in infants under two months old.
Area of Science:
- Ophthalmology
- Developmental Neuroscience
- Pediatric Optometry
Background:
- Infant visual development is crucial for cognitive and motor skills.
- Understanding the interplay between accommodation and convergence is key to diagnosing visual development issues.
Purpose of the Study:
- To evaluate the developmental trajectory of accommodation and convergence in infants.
- To identify potential refractive errors and their impact on visual development.
Main Methods:
- Paraxial photorefraction was employed to measure accommodation and convergence.
- Infants under one year of age viewed targets at varying distances (25-200 cm).
Main Results:
- Most infants demonstrated age-appropriate convergence for target distance.
- Accommodation development lagged behind convergence, with significant focusing errors observed in infants under two months.
- Early accommodative lag led to spuriously myopic refractive error estimations.
Conclusions:
- Convergence develops robustly in early infancy.
- Accommodation matures more gradually, with initial deficits potentially misdiagnosed as myopia.
- Post-two months, most infants exhibit appropriate accommodative responses, though refractive errors influence diverse accommodative styles.