The development of visual acuity in normal fullterm and preterm infants

Area of Science:

• Developmental pediatrics
• Ophthalmology
• Neuroscience

Background:

• Visual acuity development is crucial in early infancy.
• Preterm infants often exhibit developmental differences compared to fullterm infants.
• Understanding visual development in preterm infants informs early intervention strategies.

Purpose of the Study:

• To compare visual acuity development between fullterm and preterm infants during the first year of life.
• To investigate the impact of corrected age on visual acuity in preterm infants.
• To explore potential acceleration of visual development due to early visual experience in preterm infants.

Main Methods:

• Utilized the forced-choice preferential looking technique.
• Assessed 91 normal fullterm infants and 36 preterm infants with minimal perinatal complications.
• Analyzed visual acuity based on both chronological and corrected-for-prematurity age.

Main Results:

• Preterm infants' visual acuity lagged behind fullterm infants when using chronological age up to 6-8 months.
• When age was corrected for prematurity, visual acuities were similar between groups.
• Mean preterm visual acuity was consistently slightly higher than fullterm infants at corrected ages.

Conclusions:

• Corrected age is a critical factor in assessing visual acuity development in preterm infants.
• Early visual experience up to the expected date of term may slightly accelerate behavioral visual acuity in preterm infants.
• Findings suggest a potential divergence between behavioral and electrophysiological measures of visual development in preterm infants.