Eye drops are a popular and useful treatment for glaucoma, a disorder that can cause vision loss by harming the optic nerve. One of the main risk factors for the disease, intraocular pressure (IOP), is lowered by these medications. Although eye drops help lower intraocular pressure, they can also have negative side effects. Maintaining the health of your eyes and body as a whole depends on your understanding of these possible side effects and how to reduce them.