Retinopathy of Prematurity (ROP) affects the retina in premature babies who are born weighing less than about 2.75 pounds (1250 grams) or those born before 31 weeks of pregnancy. (A full-term pregnancy is about 38 – 42 weeks). This disorder usually affects both eyes at the same time, and is one of the most common causes of visual impairment in childhood.
