Glaucoma Risk Factors
Understanding Glaucoma Risk
A risk factor is a trait that makes a person more likely to get a disease. Having one or more risk factors for glaucoma does not mean the disease will show up, but it does mean closer watch is wise. Glaucoma harms the optic nerve over time. Because the early stages rarely cause symptoms, knowing your risk is the first step toward keeping your sight.
Glaucoma risk does not rest on a single factor. People with more than one risk factor face an even higher chance of getting the disease (AAO, 2024). Someone who is over 60, has a parent with glaucoma, and has diabetes carries a much greater burden than a person with just one of those traits. Doctors look at the full picture when they decide how often to test and when to start drops or other care.
Because glaucoma can steal sight with no warning, routine screening saves vision. Adults over age 40 or those with a family history of glaucoma should get a full dilated eye exam every 1 to 2 years (NEI, 2024). A single pressure check is not enough on its own. A good exam includes a look at the nerve, a pressure reading, and a test of side vision. These three steps together give the clearest picture of eye health.
Age and Ethnic Background
Age is the biggest single risk factor for glaucoma. The older a person gets, the more likely the drain system in the eye is to slow down. People over 60 face the greatest risk, while African Americans are at higher risk starting at age 40 and Mexican Americans are at notable risk after age 60 (AAO, 2024). Even people who had normal pressure readings in their 40s should keep getting checked as they age, since risk climbs with each decade.
Glaucoma does not strike all groups the same way. African Americans are 6 to 8 times more likely to get glaucoma than white Americans and tend to develop it about 10 years sooner (Mayo Clinic Health System, 2024). Hispanic and Latino groups also face higher rates, mainly later in life. These gaps come from a mix of genetic, eye-shape, and access-to-care factors. Knowing these patterns helps both patients and doctors plan the right exam schedule. If you belong to a higher-risk group, telling your eye doctor about your background can lead to earlier and more thorough testing.
The cornea is the clear front window of the eye. Its thickness can affect glaucoma risk and how pressure readings are read. Thinner corneas are tied to a higher chance of getting glaucoma. They can also make pressure readings look lower than they really are, hiding a problem. Research shows that female sex, older age, and Black race are each linked to thinner corneas (PubMed, 2014). A quick test called pachymetry measures how thick the cornea is. This helps the doctor adjust pressure results for a truer reading.
Family History and Genetics
Having a close family member with glaucoma is one of the strongest risk factors. A person with a parent or sibling who has open-angle glaucoma faces about 10 times the risk of getting the disease (NEI, 2024). Looked at from a broader view, having any family member with glaucoma makes a person 4 to 9 times more likely to develop it (NEI, 2024). When more than one family member is affected, the risk goes up even further. This is why eye doctors ask about family history at every visit. Sharing this detail can reshape the screening plan in a meaningful way.
Several genes have been tied to glaucoma. The myocilin gene is the best known link for cases that start in young adults. Other gene changes raise risk in later years. Genetic testing is not yet a routine part of eye care for most people. It may be helpful, though, in families with a strong pattern of glaucoma. Knowing that a gene change runs in the family can push siblings and children to start exams earlier.
Anyone with a close relative who has glaucoma should begin full eye exams well before age 40. These exams should include a dilated look at the optic nerve, a pressure check, and a visual field test. Finding damage early matters most in people with genetic risk, because treatment can begin before any sight is lost. Taking this step early can shape the course of eye care for decades to come. Even one exam that shows a healthy nerve gives the doctor a baseline to compare against in future visits.
Medical Conditions and Medications
Diabetes raises the risk of many eye problems, and glaucoma is one of them. Adults with diabetes are twice as likely to develop glaucoma as those without it, and over a 20-year span, people with diabetes are 48% more likely to develop open-angle glaucoma (Glaucoma Research Foundation, 2024). Good blood sugar control does not erase the risk, but it helps the whole body, eyes included. People with diabetes should pair their blood sugar visits with regular eye exams to catch pressure changes early.
High eye pressure, called ocular hypertension, is the risk factor doctors can do the most about. Elevated eye pressure is the only known risk factor for glaucoma that can be changed with treatment (PMC, 2024). Drops, laser, or surgery can all bring pressure down. Not everyone with high pressure will get glaucoma, but lower pressure cuts the odds. For people who already have the disease, keeping pressure low slows damage and helps hold vision steady.
Steroids used for swelling, allergies, or immune problems can raise eye pressure. This can happen with eye drops, skin creams, inhalers, nasal sprays, pills, or shots. In people who are very prone to this, pressure can climb within just a few days of starting a steroid (AAO EyeNet, 2024). Those at highest risk include people with existing open-angle glaucoma, a family history of the disease, high myopia, diabetes, or connective tissue disease (AAO EyeNet, 2024). Anyone on long-term steroids should have their eye pressure checked on a set schedule.
Beyond diabetes and steroids, a few other health issues tie into glaucoma risk. High myopia puts extra strain on the optic nerve because of the eye's longer shape. Past eye injuries can harm the drain tissue and raise pressure years later. Blood pressure that drops too low, especially at night, may reduce flow to the nerve. Sleep apnea has been studied as another possible link, though that research is still growing. Sharing your full health history with your eye doctor helps them keep a close watch on the right things.
What You Can Do About Your Risk
Start by listing your personal risk factors. Note your age, ethnic background, family history of glaucoma, any past eye injuries, current medicines including steroids, and whether you have diabetes or high myopia. Bring this list to your next eye exam. The more your doctor knows, the better they can shape your screening plan. Keeping this list updated year by year is a simple but powerful habit. Even small changes, like starting a new steroid inhaler, are worth noting and sharing with your eye care team at the next visit.
How often you need an eye exam depends on your risk level. People with no known risk factors can often wait until age 40 for a full baseline exam. Those with one or more risk factors should start sooner and come back more often. After age 60, yearly exams are a good rule for most people. Between visits, pay attention to changes in your side vision or night vision and report them right away.
Call your eye doctor right away if you notice sudden blurred vision, halos around lights, eye pain, or a clear loss of side vision. These can be signs of a fast pressure rise or worsening damage. Do not wait for your next visit if something feels off. If you have been told you have high eye pressure or glaucoma, keep every follow-up so your doctor can change your plan as needed.
What Patients Ask About Glaucoma Risk
Regular exercise like brisk walking may help bring eye pressure down a bit. Eating well, keeping blood sugar in check, and not smoking all support eye health. No single habit can remove glaucoma risk, but these steps may slow how fast the disease starts or moves forward when paired with medical care.
Yes. Normal-tension glaucoma damages the optic nerve even though pressure falls in the standard range. It is more common in some ethnic groups and in those with a family history. A full exam that includes nerve scans and a field test is the best way to find it.
Eye doctors usually suggest a full exam by the late teens or early 20s for children of parents with glaucoma. If the parent was found to have the disease at a young age, earlier testing may be a good idea. The exam should cover a dilated nerve check, pressure reading, and field test.
The link is not simple. Very high blood pressure can harm the small vessels that feed the optic nerve. Very low blood pressure, mainly at night, may cut blood flow to the nerve. Working with a primary care doctor to keep blood pressure in a healthy range helps both the heart and the eyes.
Most basic wetting drops are safe. Drops that take out redness by squeezing blood vessels should be used less often. Some allergy drops have mild steroids that could raise pressure over time. Check the label and ask your eye doctor before starting any new drop.
Eye pressure can shift at night. Sleeping flat may cause a small rise in pressure. A slightly raised pillow can help. Sleep apnea, where breathing stops and starts during sleep, has been looked at as a possible risk factor. If you have apnea, mention it to your eye doctor so pressure can be watched more closely.
Book Your Glaucoma Risk Assessment
If you have a family history of glaucoma, are over 40, have diabetes, or carry other risk factors, a full eye exam is the best way to catch problems early. Contact our office to set up a visit and take a forward-looking step toward guarding your long-term sight.