At just 36 weeks old, a tiny flicker in the retina of a preterm infant in Durham could hold life-changing clues. For researchers at Duke University School of Medicine, a quick, noninvasive eye scan is revealing powerful insights into how a child’s brain will develop—years before any symptoms of delay appear. Very preterm infants, those born more than 10 weeks early, face up to a 50% higher risk of developmental challenges in movement, learning, language, and behavior. Yet today, most of these issues aren’t detected until well into toddlerhood, missing a critical window for early support. That may soon change.
In a groundbreaking study published in JAMA Ophthalmology, a team led by Dr. Cynthia Toth discovered that the thickness of the retinal nerve fiber layer (RNFL)—measured using optical coherence tomography (OCT)—strongly correlates with cognitive and motor outcomes at age 2. Because the retina is an extension of the central nervous system, its structure offers a rare, accessible glimpse into early brain development. Using a handheld OCT device that emits safe infrared light, researchers captured detailed retinal images during routine eye exams for retinopathy of prematurity (ROP), a common condition in preterm infants. The scan takes just minutes and can be done at the bedside in the neonatal intensive care unit.
The study followed a cohort of very preterm infants enrolled in the ongoing "BabySTEPS" project, launched at Duke in 2016. At approximately 36 weeks postmenstrual age, each infant underwent noncontact OCT imaging. Two years later, they completed standardized developmental assessments. The results were striking: infants with a thicker RNFL at 36 weeks showed significantly better motor and cognitive performance at age 2. This simple biomarker could help clinicians identify high-risk infants much earlier, enabling timely referrals to early intervention services, physical therapy, or specialized developmental support.
The implications extend beyond prediction. By linking retinal microanatomy to neurodevelopment, the research opens a new frontier in neonatal care—one where the eye becomes a window not just to vision, but to the brain’s unfolding story. Early identification means families can access resources sooner, care plans can be tailored, and outcomes may improve across a child’s lifespan.
"Because the retina is part of the central nervous system, it gives us a unique, noninvasive way to study the developing brain," said Dr. Toth, the Joseph A.C. Wadsworth Distinguished Professor of Ophthalmology. As the BabySTEPS study continues, researchers aim to refine these imaging tools and expand their use across neonatal units, bringing the promise of early, equitable intervention within reach for thousands of vulnerable infants each year.