Glaucoma is not rare. About 4.2 million Americans have it, and roughly 80.5 million people aged 40 and older are affected worldwide. That said, your individual risk varies dramatically depending on your age, ethnicity, and family history. For adults under 40, glaucoma is uncommon. For those over 70, it becomes one of the most frequent eye conditions.
Overall Prevalence in the U.S. and Worldwide
Among all U.S. adults, glaucoma affects about 1.6% of people 18 and older. That works out to roughly 1 in 62 adults. Of those 4.2 million Americans with the condition, about 1.5 million have progressed to the point where their vision is noticeably affected. The rest have early or moderate disease that hasn’t yet changed what they can see.
Globally, the picture is similar. About 2.8% of people aged 40 and older have open-angle glaucoma, the most common form. That number is projected to climb to 3.5% by 2060, with the total number of affected people more than doubling from 80.5 million to nearly 187 million. Population aging in Asia and Africa is driving most of that increase.
How Age Changes Your Risk
Glaucoma is genuinely rare in young adults. The overall U.S. prevalence of 1.6% is pulled upward by older age groups, where the condition clusters heavily. Your risk roughly doubles with each decade after age 40. By the time you reach your 70s and 80s, glaucoma shifts from “unlikely” to “keep a close eye on it.” Most people diagnosed are over 60.
This age pattern is why eye care guidelines recommend baseline screenings starting at age 40 for most people, with more frequent checks after 60. Glaucoma typically progresses slowly and silently, so the disease can be well established before you notice anything wrong.
Ethnicity and Prevalence
Your ethnic background is one of the strongest predictors of whether you’ll develop glaucoma. In a large multicenter study, Black individuals had a prevalence of 5.7%, compared to 2.4% in White individuals. After adjusting for age, Black participants were 175% more likely to have glaucoma, and mixed-race individuals were 85% more likely than White participants. Asian populations fell in the middle, at roughly 3.5%.
These aren’t small differences. If you’re Black, your lifetime odds of developing glaucoma are more than double those of a White person of the same age. The reasons involve a mix of genetics, eye anatomy, and possibly differences in access to early detection, though the biological component is significant on its own.
Open-Angle vs. Angle-Closure Glaucoma
About 90% of glaucoma cases worldwide are open-angle glaucoma, where fluid drains too slowly from the eye and pressure builds gradually. This is the “silent thief of sight” people reference, because it causes no pain and no noticeable vision changes until significant damage has occurred.
Angle-closure glaucoma, where the drainage angle physically narrows or closes, is less common overall but follows a different geographic pattern. In Asian populations, angle-closure glaucoma is actually more prevalent than open-angle glaucoma, with a pooled ratio of about 2.2 to 1 favoring angle-closure. In Western populations, angle-closure remains relatively uncommon.
Normal-Tension Glaucoma
A surprisingly large share of glaucoma cases occur even though eye pressure stays within the statistically normal range (below 21 mmHg). This form, called normal-tension glaucoma, makes up roughly a third of open-angle cases in White populations but dominates in Asian populations, where it accounts for 46% to as high as 92% of open-angle cases. A Japanese study found the highest proportion at 92%. This matters because it means normal eye pressure readings at a screening don’t guarantee you’re in the clear.
Glaucoma in Children
Childhood glaucoma is genuinely rare. Primary congenital glaucoma, the most common form in infants, occurs in roughly 1 in 10,000 to 1 in 30,000 live births in Western countries. In certain populations with higher rates of consanguinity, the numbers are much higher: about 1 in 2,500 in Saudi Arabia and 1 in 1,250 among Slovakian Roma communities.
About 25% of congenital cases are apparent at birth or within the first month. Another 65% show up between ages 1 month and 3 years. The remaining 10% appear between age 3 and young adulthood. Unlike adult glaucoma, the childhood form often produces visible signs: enlarged eyes, tearing, and light sensitivity.
Half of Cases Go Undiagnosed
One of the most important numbers about glaucoma isn’t how many people have it. It’s how many people don’t know they have it. The CDC estimates that only 50% of people with glaucoma are aware of their diagnosis. That means roughly 2 million Americans are walking around with a condition that is slowly narrowing their peripheral vision, with no idea it’s happening.
This is a direct consequence of how glaucoma works. The most common form produces no pain, no redness, and no noticeable vision loss until the optic nerve is significantly damaged. Your brain compensates for early peripheral vision loss so effectively that many people don’t realize anything is wrong until they’ve lost a substantial portion of their visual field. By that point, the damage is permanent. Glaucoma-related vision loss cannot be reversed, only slowed or stopped with treatment.
What Makes Glaucoma More Likely
Beyond age and ethnicity, several factors push your risk higher. Having a first-degree relative (parent or sibling) with glaucoma is one of the strongest risk factors. High eye pressure, extreme nearsightedness, diabetes, and long-term corticosteroid use also increase your odds. Thin corneas can mask true eye pressure readings, making detection harder.
None of these factors alone make glaucoma inevitable. Most people with elevated eye pressure never develop glaucoma, and as the normal-tension data shows, plenty of people develop it without elevated pressure at all. Risk factors stack, though. A 65-year-old Black woman with a family history and diabetes sits in a very different risk category than a 35-year-old White man with none of those factors. For the first person, glaucoma isn’t rare at all. For the second, it’s quite unlikely for at least another couple of decades.