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Related Experiment Video

Updated: Jun 11, 2025

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
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Visual Acuity Thresholds in Preterm Newborns: An Experimental Study.

Ruth Batista Bezerra Fagundes1, Pedro Ykaro Fialho Silva2, Mirella Telles Salgueiro Barboni3,4

  • 1Physiotherapy Departament, Faculdade Ciências da Saúde do Trairi, Universidade Federal do Rio Grande do Norte (UFRN), Santa Cruz 59200-000, Brazil.

Children (Basel, Switzerland)
|September 28, 2024
PubMed
Summary

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Visual acuity in preterm infants was assessed using Teller Acuity Cards II. While not correlated with gestational age or birth weight, visual acuity showed an inverse relationship with phototherapy duration in the neonatal intensive care unit (NICU).

Area of Science:

  • Developmental Neuroscience
  • Ophthalmology
  • Neonatology

Background:

  • Visual acuity is crucial for neurological development in infants, particularly preterm infants in the neonatal intensive care unit (NICU).
  • Preterm infants undergo significant brain development during hospitalization, making visual assessment critical.
  • Understanding visual acuity in this population can inform care strategies and environmental optimization.

Purpose of the Study:

  • To assess visual acuity thresholds in preterm infants during NICU hospitalization.
  • To evaluate potential correlations between visual acuity and clinical parameters in preterm infants.

Main Methods:

  • A cross-sectional study involving 42 preterm infants (corrected gestational age 30-36 weeks 6 days) in a Brazilian NICU.
Keywords:
intensive care unitsphototherapyprematurevisual acuity

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  • Visual acuity was measured using the Teller Acuity Cards II, a psychophysical method.
  • Infants were tested while supine at a 30° elevation on caregivers' laps, with evaluators observing eye fixation.

    • Main Results:

    • Visual acuity ranged from 0.23 to 0.64 cycles per degree (cpd), with a mean of 0.32 cpd at approximately 32 weeks corrected gestational age.
    • No significant correlation was found between visual acuity and gestational age (p=0.18), birth weight (p=0.83), or duration of respiratory support (p=0.98).
    • A significant inverse correlation was observed between the number of days of phototherapy and visual acuity (p=0.04).

    Conclusions:

    • Psychophysical assessment of visual acuity is feasible in hospitalized preterm infants.
    • Visual acuity in preterm infants was not associated with gestational age, birth weight, or respiratory support duration.
    • Increased phototherapy duration was linked to lower visual acuity, suggesting a potential impact on visual development.