in a 9 year prospective study of rop in our unit, we noted that all neonates <36 weeks of gestation , irrespective of birthweight should be screened for rop, beginning at 32 weeks of gestaion till term gestation.14 of our babies had birth weight >2000gm and gestation >34 weeks, 30% with a bwt of >1500gms. So our policy is to screen all neonates <36 weeks of gestation.