silmahaigus, mis on põhjustatud silma võrkkesta veresoonte ebaküpsest arengust, a bilateral retinal disease of premature infants especially when placed in an abnormal oxygen environment, an ocular disorder of premature infants that occurs when the incompletely vascularized retina of such an infant completes an abnormal pattern of vascularization and that is characterized by the presence of an opaque fibrous membrane behind the lens of each eye