Arcus senilis is a whitish or grayish ring that forms around the outer edge of the cornea, the clear front surface of your eye. It’s caused by fat deposits, primarily cholesterol, building up in the corneal tissue over time. The ring is extremely common in older adults and does not affect vision. However, when it appears in younger people, it can signal elevated blood lipid levels worth investigating.
What It Looks Like
The ring appears as a hazy, white-to-gray arc or full circle sitting just inside the border where the cornea meets the white of the eye. A narrow strip of clear cornea, called the lucid interval of Vogt, separates the ring from that border. The deposits sit within the deeper layers of the cornea (the stroma), not on the surface, which is why you can’t feel them or wipe them away.
Arcus doesn’t appear all at once. It typically starts as two separate arcs at the top and bottom of the cornea, because blood flow is strongest in those regions and delivers more lipids there. Over time the arcs extend sideways and eventually connect into a complete ring. You might notice it yourself in the mirror, or an eye doctor may spot it during a routine exam using a slit lamp, the magnifying instrument used to examine the front of the eye.
Why Lipids Collect There
The cornea itself has no blood vessels, but it sits right next to tiny capillaries at the limbus, the junction between the cornea and the white of the eye. Cholesterol, triglycerides, and other fats circulating in the blood seep through these capillaries into the peripheral cornea. Once the lipids travel beyond the reach of those small vessels, they get trapped and slowly accumulate in the tissue. The process mirrors, on a small scale, what happens inside artery walls during atherosclerosis: cholesterol particles infiltrate tissue and build up over years.
How Common It Is
Arcus senilis becomes increasingly prevalent with age. In a large study of adults 60 and older in Tehran, about 34% of people aged 60 to 64 had visible corneal arcus. That figure climbed steadily: roughly 43% by age 65 to 69, 52% by age 70 to 74, and 56% in those 80 and above. By the time you’re in your 80s, having the ring is more common than not having it. Men tend to develop it earlier and more frequently than women.
Because it’s so widespread in older adults, the ring alone isn’t considered a disease. The name itself reflects this: “senilis” simply means “of old age.”
The Heart Disease Connection
The relationship between arcus senilis and cardiovascular risk depends heavily on your age. In people under 50, the ring is uncommon and tracks much more closely with atherogenic lipid profiles, particularly high LDL cholesterol. Early research found that men under 50 with arcus had roughly three to four times the risk of dying from coronary heart disease compared to those without it, even after adjusting for cholesterol levels and smoking. For this younger group, the ring functions as a visible flag for dyslipidemia and potentially premature heart disease.
In middle-aged and older adults, the picture is different. Large population studies show that once you account for age, sex, lipid levels, and other standard risk factors, arcus doesn’t independently predict heart events. A study in a Singapore Indian population found a modest association (about 52% higher odds of cardiovascular events), but the ring added almost nothing to the predictive power of conventional risk calculators. In other words, for most older adults, arcus reflects cumulative lipid exposure over a lifetime rather than an active, independent danger signal.
The bottom line: arcus in someone under 40 or 50 deserves a lipid panel and further evaluation. Arcus in a 75-year-old is overwhelmingly likely to be a normal aging change.
When It Appears in Younger People
When the ring shows up before age 40, it’s called arcus juvenilis rather than arcus senilis. This distinction matters because it shifts the clinical meaning. A younger person with visible corneal lipid deposits is more likely to have an underlying condition driving elevated blood fats, such as familial hypercholesterolemia (an inherited tendency toward very high cholesterol). Some clinicians have also noted an association with alcohol use disorder.
A ring appearing in only one eye at any age is also worth investigating. Bilateral, symmetric arcus in an older person is expected. A one-sided ring suggests something unusual about blood flow or lipid delivery to that eye specifically.
Does It Affect Your Vision?
No. Arcus senilis does not impair vision. The lipid deposits sit in the far periphery of the cornea, well outside the central zone that light passes through to reach your retina. The ring doesn’t change the shape of the cornea or interfere with how it focuses light. It’s a cosmetic change only.
Treatment and Reversibility
There is no treatment for arcus senilis itself, and none is needed. The deposits are permanent. Even if you lower your blood lipid levels significantly, the cholesterol already embedded in the corneal tissue stays put. The ring won’t shrink or fade.
If arcus appears at a young age and a lipid disorder is found, the focus of treatment is the underlying cholesterol or triglyceride problem, not the ring. Managing elevated lipids reduces cardiovascular risk regardless of whether the corneal deposits ever change. The ring, in that context, served its purpose as an early warning sign.