What Is Glaucoma and How Is It Treated?

You went in for a routine eye check, expecting a new glasses prescription, and came out hearing a word you weren't expecting: glaucoma. What is it, and what happens next? In plain terms, glaucoma is a group of eye conditions in which the optic nerve — the cable that carries visual information from the eye to the brain — becomes damaged, often in connection with pressure inside the eye. The 3-minute-23-second 3D animation at the top of this page shows how glaucoma surgery works, and it's a helpful visual anchor for the treatment part of this walkthrough.

Why does it so often go unnoticed at first?

Early glaucoma typically has no pain and no obvious symptoms, which is why it's sometimes called the "silent thief of sight." Vision loss tends to begin at the edges of what you see, so it can creep in gradually while your central vision still feels normal. This site's short video "How does Glaucoma Develop" walks through that slow, symptom-free early course. Because you can't rely on symptoms alone, regular eye examinations — where pressure, the optic nerve, and the visual field can be checked — are how it's usually picked up.

What will the eye doctor actually check?

An assessment usually combines several pieces: measuring the pressure inside the eye, examining the optic nerve at the back of the eye, and testing the visual field to map any areas of lost vision. Imaging of the nerve may be added. No single test tells the whole story on its own, so your specialist puts the findings together before deciding whether you have glaucoma and, if so, what kind and how advanced it is. That combined picture is what guides treatment — an article can't substitute for it.

So how is glaucoma treated?

Treatment aims to lower the pressure inside the eye and so protect the optic nerve from further damage; it can't restore vision that has already been lost. The usual starting point is prescription eye drops used regularly. If drops aren't enough on their own, laser treatment may be offered to help fluid drain from the eye more easily. Surgery is the next step for some people — the animation above illustrates the surgical approach, in which a new drainage pathway is created so fluid can leave the eye and pressure falls. Which route fits you, and whether routes are combined, is a decision for your eye specialist based on your examinations over time. Glaucoma also sits alongside other common eye problems rather than replacing them — if a cloudy lens is part of your picture too, our guide to cataract and how it is removed explains that separate condition in plain English.

What does living with it look like?

For most people it means staying in follow-up: using any prescribed drops as directed, keeping review appointments even when your vision feels fine, and having pressure and visual fields rechecked so the plan can be adjusted. Think of it less as a one-off fix and more as long-term protection of the vision you still have. If anything about your eyes changes noticeably, don't wait for the next routine visit — contact your eye care team.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician and researcher.

Educational only — this article is general information about glaucoma, not medical advice and not a recommendation for or against any treatment. Whether you have glaucoma and how it should be treated are decisions for your own eye specialist, who can examine you and review your test results.

Frequently Asked Questions

Can glaucoma be cured?
No. Treatment lowers eye pressure to protect the optic nerve and slow or stop further damage, but vision already lost to glaucoma can't be restored — which is why early detection through regular eye examinations matters.

Do eye drops treat glaucoma on their own?
For many people, prescription drops are the first treatment and may be enough to control the pressure. Others also need laser treatment or surgery. Your specialist decides based on repeated pressure and visual-field checks.

Does everyone with high eye pressure have glaucoma?
No. Raised pressure is a risk factor and a common finding, but glaucoma is diagnosed from the combination of pressure, optic nerve appearance, and visual field results — not from a pressure reading alone.