Herpes, however, raises IOP and can be a real bear. That is a tough one, too. It can infiltrate the meshwork and plug it up, too. If the oil has caused pupillary block, it can cause an attack of glaucoma. You buy it.
Silicone oil is just that.
It is liquid silicone that is used in retina surgery to replace the vitreous and hold the retina in place in the eye. It is usually reserved for very bad retinal detachments. Most people who have a vitrectomy don't get oil. They get salt water. They seem to break down after a few days, unless they are trapped behind the lens.