Objective To explore the effects of different modes of respiratory support on the occurrence of retinopathy( ROP)and the levels of VEGF and IGF- 1 in premature infants. Methods A total of 578 premature infants with gestational age( GA)of 34 weeks or less who had survived from the time of the initial ophthalmologic examination to the final ROP examination were included in the study. Each infant was categorized as no ROP,stage 1,stage 2,more than stage 3 ROP or stage 3 ROP + plus disease. The serum levels of ...