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Published on: March 17, 2023
The assessment of visual acuity in children with periventricular damage: a comparison of behavioural and
1Division of Child Neurology and Psychiatry, University of Pisa, Italy.
Insights
This study compared visual acuity measurements in children with brain damage, finding good correlation but better results with behavioral methods. Compensatory mechanisms may explain differences between electrophysiology and visual acuity cards.
Area of Science:
- Neuroscience
- Ophthalmology
- Developmental Pediatrics
Background:
- Periventricular leukomalacia (PVL) is a common brain injury in preterm infants.
- Assessing visual acuity in children with brain damage presents diagnostic challenges.
- Electrophysiology and behavioral methods are used to measure visual acuity.
Purpose of the Study:
- To investigate the concordance between sweep visual evoked potentials (VEPs) and Acuity Cards (AC) for measuring visual acuity.
- To explore the relationship between measurement discrepancies and brain structural changes in children with PVL.
Main Methods:
- A cohort of 29 children with PVL underwent visual acuity assessment using both sweep VEPs and AC.
- Correlation analysis was performed between the two methods.
- The ratio of VEP to AC acuity was correlated with neuroimaging findings, specifically corpus callosum thinning.
Main Results:
- A good overall correlation was observed between sweep VEPs and AC measurements.
- Behavioral acuity values (AC) were generally better than electrophysiological values (VEPs).
- The VEP/AC ratio showed a significant correlation with the degree of posterior corpus callosum thinning.
Conclusions:
- While both methods show correlation, behavioral acuity cards may offer relatively better values in children with PVL.
- The observed differences may reflect compensatory mechanisms in the brain that differentially impact VEP and AC measurements.
- Corpus callosum integrity is associated with the concordance between electrophysiological and behavioral visual acuity assessments in this population.
Abstract:
It has been controversial whether electrophysiology offers better precision than behavioural techniques in measuring visual acuity in children with brain damage. We investigated the concordance between sweep VEPs and Acuity Cards (AC) in 29 children with periventricular leukomalacia (PVL), the most common type of brain damage in preterm infants. An overall good correlation was shown but with relatively better behavioural acuity values. VEP/AC ratio was significantly correlated to corpus callosum posterior thinning. We propose that this result reflects the efficacy of the compensatory mechanisms following early brain damage which may differentially affect the two methods.
