What are the risks of leaving silicone oil in a child's eye indefinitely?

Silicone oil most often is put in an eye following retinal detachment surgery to help hold the retina in place. Whenever possible, we plan on removing the oil after one to three months to avoid risks such as cataract, corneal clouding, or glaucoma. Unfortunately, in some patients, the retinal detachment is severe enough that we have high concern that the retina is likely to re-detach if we removed the oil. As a result, we make the difficult risk/benefit decision to leave the oil in place indefinitely.