Glaucoma in Black adults: why screening can save your sight

Glaucoma is a group of diseases that damage the optic nerve, the cable that carries images from the eye to the brain. The most common form, primary open-angle glaucoma (POAG), builds slowly as pressure inside the eye injures that nerve. About 3 million Americans have glaucoma, and roughly half of them do not know it. For Black Americans the stakes are higher at every step. The CDC reports that Black people are 6 to 8 times more likely to develop glaucoma than White people, and it is the leading cause of irreversible blindness in this population.

The landmark Baltimore Eye Survey, a population study of more than 5,000 adults, found age-adjusted POAG rates four to five times higher in Black participants than White participants. The gap was widest in middle age: among people aged 40 to 49, the rate in Black adults was already higher than the rate in White adults two decades older. The same survey found that nearly half of the people with glaucoma did not know they had it, and Black participants were less likely to have been diagnosed or treated.

The disparity does not stop at who gets the disease. A 2022 analysis from the New York Eye and Ear Infirmary of Mount Sinai found Black patients had a five-fold higher risk of advanced vision loss at the time of a new POAG diagnosis compared with White patients. In plain terms, by the time the disease is caught, it is often already further along.

Open-angle glaucoma causes no pain, no redness, and no blurriness in its early and middle stages. It takes peripheral vision first, the edges of what you see while looking straight ahead. The brain fills in the missing pieces, and the other eye compensates, so most people notice nothing for years. By the time the loss reaches central vision, the damage to the optic nerve is permanent. Lost nerve fibers do not grow back.

This is the core trap, and it kills the most common excuse for skipping the eye doctor: "I see fine, so my eyes are fine." You can have moderate glaucoma and read this sentence without difficulty. Seeing well in the center says nothing about the side vision you have already lost or the pressure quietly damaging your optic nerve. The only way to know is an exam that looks at the nerve and tests the full field of vision.

The CDC and the National Eye Institute list the main risk factors for open-angle glaucoma:

• Being Black and over 40. African ancestry is one of the strongest known risk factors, independent of everything else.
• A family history of glaucoma. Having a parent or sibling with the disease raises your risk substantially.
• High eye pressure (intraocular pressure). The main treatable driver, though glaucoma can occur even at normal pressures.
• Diabetes. People with diabetes are about twice as likely to develop glaucoma.
• Being over 60, for everyone.
• Nearsightedness (high myopia), which is linked to a higher risk of open-angle glaucoma.

Part of the elevated risk in people of African ancestry appears to be inherited. Research on individuals of African descent has identified anatomical differences, including thinner corneas and larger optic-nerve cups, along with genetic associations that help explain why the disease is more common and more aggressive in this group. Diabetes and high blood pressure are common in Black communities and add to the load. If you are managing those conditions, the same visit that protects your heart and kidneys is a reason to protect your eyes. Our guides on high blood pressure in Black men and on reversing prediabetes cover the conditions that travel alongside glaucoma risk.

A glasses prescription is not a glaucoma test. Neither is the wall chart at the DMV or a drugstore vision machine. A comprehensive dilated eye exam is the standard, and it includes several parts:

• Dilation. Drops widen your pupils so the eye doctor can see the optic nerve clearly at the back of the eye. Plan for blurry near vision and light sensitivity for a few hours afterward.
• Optic-nerve exam. The doctor looks directly at the nerve for the cupping and thinning that glaucoma causes.
• Eye-pressure check (tonometry). A quick measurement of the pressure inside the eye.
• Visual-field test (perimetry). You click a button when you see flashes of light in your side vision. This maps the blind spots glaucoma creates before you would ever notice them.
• OCT imaging. Optical coherence tomography is a non-contact scan that measures the thickness of the optic-nerve fiber layer. It can detect damage early and track tiny changes over time.

Either an ophthalmologist (a physician who can do surgery) or an optometrist can perform this exam and screen for glaucoma. What matters is that the visit is a dilated comprehensive exam, not a quick refraction for new lenses.

The American Academy of Ophthalmology recommends that all adults get a baseline comprehensive eye exam by age 40. Because Black adults are at higher risk for glaucoma, the Academy advises more frequent exams: every 2 to 4 years before age 40, every 1 to 3 years from 40 to 54, and every 1 to 2 years from 55 to 64, even with no symptoms.

If glaucoma runs in your family, do not wait for 40. Tell an eye doctor about the family history and ask to start screening earlier and more often. A first-degree relative with glaucoma is one of the clearest reasons to get the full exam now rather than later.

Every proven glaucoma treatment works by lowering eye pressure, which slows or stops damage to the optic nerve. It does not restore lost vision, which is why catching the disease early matters so much. The main options:

• Eye drops. Prostaglandin analogues, taken once a day, are the usual first medication. They lower pressure by helping fluid drain from the eye. Other drop classes can be added if one is not enough.
• Selective laser trabeculoplasty (SLT). A painless in-office laser that improves the eye's natural drainage. The LiGHT trial, a randomized study of 718 patients, found that starting with SLT controlled pressure as well as drops, with more patients staying at target pressure and none needing pressure-lowering surgery in the laser-first group. SLT is now offered as a first-line option, not just a backup.
• Surgery. When drops and laser are not enough, procedures that create a new drainage path can lower pressure further and protect remaining vision.

Treatment can also help people who do not yet have glaucoma but have high eye pressure. The Ocular Hypertension Treatment Study, which enrolled 408 Black participants, found that pressure-lowering drops roughly halved the rate at which Black participants with elevated pressure went on to develop glaucoma. That is strong evidence that finding and treating high pressure early changes the outcome.

Book a comprehensive dilated eye exam and say plainly that you want to be screened for glaucoma. Ask for the full workup: optic-nerve exam, eye-pressure check, a visual-field test, and OCT imaging. Bring your family history, and mention any diabetes, high blood pressure, or nearsightedness. If you are diagnosed, ask which pressure-lowering option fits your life, including whether SLT laser is right for you. Find a Black ophthalmologist or optometrist in our directory to start with someone who takes your risk seriously.