Related Experiment Videos
Visual acuity screening of preterm infants
Insights
Visual acuity develops based on conception age, not birth age. For preterm infants, visual acuity screening should use tools matched to postterm age for accurate results.
Area of Science:
- Ophthalmology
- Developmental Pediatrics
- Infant Vision
Background:
- Visual development in preterm infants is a critical area of research.
- Assessing visual acuity in infants requires age-appropriate methodologies.
- Postnatal age can be a misleading metric for preterm infant development.
Purpose of the Study:
- To investigate the correlation between visual acuity and corrected age (postterm age) versus chronological age (postnatal age) in preterm infants.
- To determine the optimal age-based parameter for visual acuity screening in preterm infants.
Main Methods:
- Screening visual acuity in 36 healthy preterm infants.
- Comparing visual performance at 8 and 12 weeks of postnatal age with full-term infants.
- Comparing visual performance at 4, 8, and 12 weeks of postterm age with full-term infants.
Main Results:
- Preterm infants showed poorer visual acuity at 8 and 12 weeks postnatal age compared to full-term infants.
- No significant differences in visual acuity were observed when comparing preterm infants at 4, 8, and 12 weeks postterm age to full-term infants of equivalent postterm ages.
- Visual acuity in preterm infants correlates more strongly with postterm age than postnatal age.
Conclusions:
- Visual acuity development in preterm infants is better represented by age from conception (postterm age).
- Visual acuity screening for preterm infants should utilize testing tools calibrated to postterm age.
- This finding has implications for early detection of visual impairments in preterm populations.
Abstract:
Visual acuity was screened in 36 healthy infants born 4 or more weeks prior to term. Preterm infants tested at 8 and 12 weeks of postnatal age showed significantly poorer performances than those shown by 8- and 12-week-old full-term infants. However, no differences in performance were found when the scores of preterm infants tested at 4, 8, and 12 weeks of postterm age (i.e., 4, 8, and 12 weeks from due date) were compared with scores of 4-, 8-, and 12-week-old full-term infants. The results suggest that visual acuity is more closely correlated with age from conception than with age from birth and that visual acuity screening in preterm infants should be carried out with acuity gratings appropriate for the infant's postterm age rather than with acuity gratings appropriate for the infant's postnatal age.