The survival rate of premature infants has been raised in recent years along with the developing of perinatal medicine and advancing neonatal intensive care unit(NICU).

• 近年来,随着围产医学的发展和NICU抢救水平的不断提高,早产儿的存活率不断上升,而存活中的早产儿,发生早产儿视网膜病也随之增多。