How do eye drops lower pressure in primary open-angle glaucoma?

In the context of primary open-angle glaucoma, the primary goal of medical treatment is to lower intraocular pressure, which helps prevent further optic nerve damage and vision loss.1

Eye drops used for this purpose function by targeting the dynamics of aqueous humour, the fluid that maintains the pressure and shape of the eyeball. Specifically, these therapies work through two main mechanisms:21

• Increasing Outflow: They facilitate the drainage of aqueous humour from the eye, typically by improving flow through the trabecular meshwork or other drainage pathways.21
• Decreasing Production: They reduce the rate at which the ciliary body secretes new aqueous humour into the eye.21

By balancing the rate of fluid formation with the resistance to its outflow, these medications effectively reduce the pressure within the eye. While eye drops are the standard medical approach, other treatments, such as oral carbonic anhydrase inhibitors, may be used to further reduce fluid production if necessary.1