Most people have found that cataract surgery lowers IOP over the long haul. They can cause macular edema in aphakic eyes, and if the necessary pathway for aqueous drainage has been damaged somehow, they might not work. Yes, because it is easily missed and lowering the already-low IOP is harder. Yes, but the failure rate is much higher. Yes, steroids often help to calm the inflammation.
Inflammatory glaucoma is an odd one.
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.