By the fourth month of pregnancy, the fetal retina has begun to develop vascularization. Such formation of blood vessels appears to be very sensitive to the amount of oxygen supplied, either naturally or artificially. In rare cases<unk>  has been found in some patients with a mutation in the NDP gene, which is normally associated with the more damaging Norrie disease. Risk factors Various risk factors contribute to the development of<unk> . They are: *<unk>  * High exposure to oxygen * Low birth weight * Various types of infections * Cardiac defects * Anaemia * Low vitamin E level
Retinopathy of prematurity
Vitreoretinopathy
Meningism
Familial exudative vitreoretinopathy
Neonatal jaundice
Neonatal encephalopathy
Neonatal conjunctivitis
Congenital cataract