I am 27 years old and had a bone marrow transplant for leukemia and have just this week gotten catarct surgery for my steriod induced pcs catarcat in my left eye. The follow up detected post cataract opacification. I was told I would need YAG in the future. Is this YAG procedure a one time thing? or will I regularly need it( as in does the opacification grow back?) thank you