Primary open angle glaucoma is the most common type of glaucoma. If it left untreated (around 25years) or poorly controlled it may leads to permanent vision loss.

First choice for drug treatment is either beta blocker or protaglandin analogue, they both come in the form of eyedrops. They normally initiate treatment on one eye and compare the outcome to the other eye. Obviously the specialist will set the IOP target for individual patient.

Alternatively, there is more invasive approach like trabeculoplasty.

Just sharing my little knowledge on the topic.