- Congenital Non-ocular Anomalies: Babies will be excluded from this study if they have a severe congenital non-ocular anomaly. Such exclusions include anencephaly, trisomy 13, trisomy 18, or severe cardiac or pulmonary abnormalities. The neonatologist caring for the baby will determine whether a particular congenital abnormality would exclude the baby from participation in this study.