Since premature babies are born early, the blood vessels of the retina are not yet mature and are prone to retinopathy. After the onset of this pathology, the child is unlikely to show abnormal eye appearance because the lesions of the fundus are not visible in appearance, so parents are prone to neglect. In 2004, the Ministry of Health issued a guideline for the use of oxygen in preterm infants and a guideline for the screening of retinopathy. According to this guideline, all of our premature infants who weigh less than 2 kg and are born before 37 weeks should undergo fundus examination at the ophthalmologist. The reason for this is that there is a time window for the development and treatment of retinopathy of prematurity, and if it is not detected in time and treated late, it can cause permanent damage or even blindness. Premature babies should have their fundus checked 4 weeks after birth. Depending on the situation, the ophthalmologist will make an appointment for the next visit, usually once every 1 to 2 weeks, until the retina is mature. If laser treatment is needed, the ophthalmologist will inform. Parents should never be careless and say that our child is growing quite well, too young, don’t hold it to the hospital, go back in three months, and often the best time for treatment is missed.