Usually, fluid called aqueous humor flows freely through the anterior chamber in the eye and exits through the drainage system, known as the trabecular meshwork. If that system is blocked or isn't functioning well, the pressure inside the eye builds. This pressure can damage the optic nerve. With the most common type of glaucoma, this results in gradual vision loss.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make a gift to our 2025 Drive to Cure Cancer and transform the way cancer is treated and defeated.