Talk to Eye Specialist on ROP Stage 5 , Retina

my 5 months old son diagnosed with rop stage 5.. he is a premature baby who is born on 31st week .. now he is 5 months old and suddenly we got to know about this problem from a eye specialist then we got rop test done and b ultrasonography and we got to know that he is on rop stage 5 .. I want to know about treatment of this if it is possible from anyone or anywhere in the world ..