We will use a simple water bath enclosure for a standard 20 MHz probe currently in general ophthalmic use to determine whether this simple technique might supplant indirect ophthalmoscopy as a screening technique. We will compare, using masked observers, the clinical findings of indirect ophthalmoscopy of neonatal infants with ultrasonic findings to determine if a correlation in the stages of retinopathy of prematurity (ROP) between the two techniques existed.