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Glaucoma is not one disease. It is a group of conditions that damage the optic nerve, the cable at the back of the eye that carries images to the brain. The most common form, open-angle glaucoma, usually develops slowly and without pain. You can lose peripheral vision for years and not notice. That quiet progress is why the top 7 risk factors for glaucoma matter: they help you and your eye doctor decide how often to check for it.
About 3 million people in the United States have glaucoma, and the CDC estimates that half do not know they have it. Globally, it is a leading cause of irreversible blindness. Risk factors do not guarantee you will get glaucoma, and plenty of people with several risk factors never develop it. Still, knowing where you stand turns a vague worry into a practical screening plan.
1. Age: The Risk Curve Starts Bending After 40
Age is the simplest risk factor and one you cannot change. Glaucoma becomes more common after 40, and the rate climbs sharply after 60. For people of African or Afro-Caribbean descent, screening often starts earlier because risk rises sooner.
This does not mean a 42-year-old should panic. It means a baseline eye exam around 40 is a sensible checkpoint, especially if you have skipped regular eye care. A dilated exam can look at the optic nerve directly, and your doctor can record a starting point for future comparison.
2. High Eye Pressure: The Best-Known Lever
Intraocular pressure, or IOP, is the fluid pressure inside the eye. Normal is often listed as 10 to 21 millimeters of mercury (mmHg), but those numbers are a guide, not a guarantee. Some people develop glaucoma at 16 mmHg. Others walk around at 24 mmHg for years with no optic nerve damage. This is why eye pressure alone cannot diagnose glaucoma.
Even so, high eye pressure remains the most important modifiable risk factor. Lowering it, whether with drops, laser treatment, or surgery, is the main way doctors slow glaucoma progression. If your IOP is in the high 20s or 30s, that deserves prompt attention.
3. Family History and Genetics
Glaucoma runs in families. Having a parent or sibling with the condition raises your risk several times over, with some estimates putting first-degree relatives at 4 to 9 times the risk of the general population. The genetic picture is complex, so a home DNA kit will not give you a clean answer.
What it can do is change your history. Tell your eye doctor if a relative has glaucoma, especially if that relative lost vision or was diagnosed young. Glaucoma is not the only eye condition with a family thread, either. Many common eye diseases have genetic links, and a family eye history is worth writing down once and updating as relatives age.
4. Race and Ethnicity
Glaucoma affects groups differently. People of African, Afro-Caribbean, and Hispanic or Latino descent have higher rates of open-angle glaucoma and tend to develop it earlier. African American adults are also more likely to experience rapid progression and blindness from the disease.
People of Asian descent face a higher risk of angle-closure glaucoma, a less common form where the drainage angle suddenly narrows. It can cause an acute attack with severe eye pain, nausea, halos around lights, and a red eye. That is an emergency, not a wait-and-see situation. Ethnicity is not destiny, but it does influence when screening should begin.
5. Diabetes, High Blood Pressure, and Other Health Conditions
Diabetes damages small blood vessels throughout the body, including those in the retina and optic nerve. Adults with diabetes are roughly twice as likely to develop open-angle glaucoma as those without it. High blood pressure adds another layer because blood flow to the optic nerve can suffer when pressure swings or vessels are damaged.
If your blood pressure runs high, hypertension treatment and prevention covers the basics beyond medication, including home monitoring and follow-up. Diet matters too, and this guide to high blood pressure treatment, prevention, and diet explains practical food changes that support healthier numbers.
Other conditions linked to glaucoma include sleep apnea, migraines, and poor circulation. The connections are not always fully understood, but they are another reason to keep overall health in view rather than treating the eyes as a separate system.
6. Thin Corneas, Nearsightedness, and Eye Injury
Eye anatomy matters. A thin central cornea, measured with a quick painless test called pachymetry, can make eye pressure readings seem lower than they really are. People with thin corneas also appear to have a higher glaucoma risk even after pressure is taken into account.
Severe nearsightedness is another factor. Longer eyes can have structural differences that make the optic nerve more vulnerable. A past eye injury, especially a blunt blow from a ball, elbow, or airbag, can raise risk years later. So can long-term inflammation inside the eye, known as uveitis.
If you have had an eye injury, tell every eye doctor you see. That detail belongs in your record even if the injury happened decades ago and seemed minor at the time.
7. Long-Term Steroid Use
Corticosteroids are powerful drugs. They calm inflammation and save vision in many conditions. They can also raise eye pressure in some people, especially when used for months or years. The risk applies to steroid eye drops, pills, injections, and even steroid nasal sprays in susceptible people.
Never stop a prescribed steroid on your own, particularly after an eye surgery or during treatment for inflammation. Instead, ask whether your eye pressure should be monitored while you use it. If you have been on prednisone for an autoimmune condition or use steroid drops for allergies, that is a detail your eye doctor needs.
What to Do If Several Risk Factors Apply
One risk factor is a question mark. Several together are a reason to book a comprehensive dilated eye exam. A good glaucoma check is more than a puff of air. It usually includes:
- Eye pressure measurement with a calibrated device
- Corneal thickness measurement
- Dilated examination of the optic nerve
- Photographs or scans of the optic nerve, such as OCT
- Visual field testing to map peripheral vision
Screening schedules are personal. A common approach is a baseline exam at 40, then every two to four years if risk is average. After 60, many doctors suggest every one to two years. If you have high eye pressure, a family history, or African ancestry, you may need yearly checks or more.
Watch for sudden changes, too. Severe eye pain with nausea, blurred vision, and halos can signal angle-closure glaucoma, which needs emergency care. For the slow, silent form, the best defense is a scheduled exam you keep even when your eyes feel fine.
