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Visual acuity, binocular vision, and ocular muscle balance in VLBW children
Insights
Children with very low birth weight (VLBW) showed higher rates of visual impairments, specifically in binocular vision and ocular muscle balance, compared to normal birth weight (NBW) peers. These visual issues were linked to longer intensive care stays and mechanical ventilation.
Area of Science:
- Ophthalmology
- Neonatal Medicine
- Developmental Pediatrics
Background:
- Premature birth, particularly very low birth weight (VLBW), is associated with various health complications.
- Visual development can be impacted by the intensive care environment and medical interventions required for VLBW infants.
- Long-term neurodevelopmental outcomes in VLBW survivors are a significant area of research.
Purpose of the Study:
- To compare visual function, including visual acuity, binocular vision, and ocular muscle balance, between 6-year-old children born with VLBW and those with normal birth weight (NBW).
- To identify potential associations between specific neonatal intensive care factors and visual impairments in VLBW children.
Main Methods:
- A cohort of 34 VLBW and 31 NBW children, all 6 years old, underwent comprehensive eye examinations.
- Tests included assessments of visual acuity, binocular vision function, and ocular muscle balance (strabismus/phoria).
- Neonatal data, including duration of mechanical ventilation and intensive care nursery (ICN) stay, were collected for the VLBW group.
Main Results:
- Children in the VLBW group demonstrated significantly higher rates of failure in tests assessing binocular vision and ocular muscle balance compared to the NBW group.
- Failure in binocular vision tests was correlated with increased days of mechanical ventilation and longer stays in the intensive care nursery during early infancy.
- No significant difference was noted in basic visual acuity between the two groups, suggesting specific deficits in higher-order visual processing.
Conclusions:
- VLBW children are at increased risk for developing binocular vision and ocular muscle balance problems by age 6.
- Neonatal factors such as prolonged mechanical ventilation and intensive care nursery stays may contribute to these visual deficits.
- Ophthalmological screening and early intervention for visual function are crucial for VLBW survivors to mitigate long-term impacts.
Abstract:
Thirty-four very low birth weight (VLBW) 6-year olds and 31 normal birth weight (NBW) 6-year olds were assessed for visual acuity, binocular vision, and ocular muscle balance. Significantly more of the children in the VLBW group failed the tests of binocular vision and ocular muscle balance. Failure in tests of binocular vision was associated with higher numbers of days on mechanical ventilation and higher number of days in the intensive care nursery during the first months of life.