Retinopathy of prematurity (ROP) occurs in 10.8%-21.7% of preterm infants born at ≤34 weeks or with a birth weight of less than 2000 g. Currently, ROP is the first factor causing blindness in children in developed countries. In April 2004, the Ministry of Health issued the Guidelines for the Treatment of Premature Infants with Oxygen and Prevention of Retinopathy, which stipulates that preterm infants with birth weight less than 2000 g and gestational age less than 32 weeks must undergo fundus examination. The retina of preterm infants is not yet fully developed. If they are in a hyperoxic environment, the retinal vessels will contract and block, causing local ischemia and hypoxia, inducing abnormal proliferation of retinal vessels, causing a series of changes such as exudation, hemorrhage and mechanization, which in turn will pull and cause retinal detachment and affect vision. If the child is examined on time after birth and ROP is detected, the child’s eyes will be the same as normal people, but the best time available for treatment is only two weeks, so it is also called the time window, and missing the time window for treatment may lead to irreversible consequences. Currently, our hospital uses the most advanced international fundus examination equipment, RetCam3, to perform the examination, which reduces the discomfort of the child, shortens the examination time, and provides clear images for inter-hospital and international consultation.