A pterygium is a wedge-shaped growth of fleshy tissue that starts on the white of your eye and slowly creeps onto the clear front surface (the cornea). It’s benign, not cancerous, but it can blur your vision, cause persistent irritation, and change the shape of your eye enough to require glasses or surgery. Sometimes called “surfer’s eye,” it’s one of the most common eye conditions in sunny climates, affecting anywhere from 0.3 to 33 percent of the population depending on geography.
What a Pterygium Looks Like
The growth is triangular, with a rounded head that advances toward the center of the cornea and a wider base anchored in the conjunctiva, the thin membrane covering the white of your eye. It’s made of fibrous, blood vessel-rich tissue covered by a layer of conjunctival skin. Most pterygia grow from the inner (nasal) corner of the eye, though they can appear on the outer side too. Early on, it may look like a small, pinkish bump. Over time it becomes more raised, fleshy, and visible, with tiny blood vessels running through it.
Pterygium vs. Pinguecula
People often confuse these two growths. A pinguecula is a small, yellowish or white bump that stays on the conjunctiva and never crosses onto the cornea. A pterygium, by contrast, extends onto the cornea itself. That distinction matters because a pinguecula rarely affects vision, while a pterygium can. Both share similar causes, and a pinguecula can sometimes develop into a pterygium over time.
Why It Develops
The primary driver is long-term exposure to ultraviolet light, particularly UV-B radiation. This is why the condition is most common in what researchers call the “pterygium belt,” the band of tropical and subtropical land between 40 degrees north and 40 degrees south of the equator, where UV exposure is strongest year-round. People who spend significant time outdoors, especially around reflective surfaces like water, sand, or snow, face the highest risk.
Wind, dust, and dry air also contribute. These irritants cause chronic inflammation on the eye’s surface, which over time can trigger the overgrowth of tissue. The UV damage appears to disrupt specialized stem cells at the border between the conjunctiva and the cornea, allowing abnormal tissue to grow where it normally wouldn’t. As the growth advances, it fragments a protective layer of the cornea called Bowman’s layer, which doesn’t regenerate.
How It Affects Your Vision
A small pterygium may cause no vision problems at all. But even before it reaches the center of your eye, it can distort the shape of the cornea and cause astigmatism, a type of blurriness caused by an uneven curve. The growth flattens the cornea along its leading edge, pulling it out of its normal round shape. Research shows that a pterygium induces significant astigmatism once it extends past about 45 percent of the corneal radius. Even smaller growths, those covering just 25 percent of the corneal diameter, can produce measurable optical distortions.
Larger pterygia cause greater refractive errors. If the growth eventually covers the pupil, it physically blocks light from entering the eye, which is the clearest indication for surgery. But the vision impact often starts well before that point.
Common Symptoms
Many people with a small pterygium notice only a cosmetic change. As it grows, typical symptoms include:
- Redness over the affected area, sometimes extending across the white of the eye
- Irritation or burning, often described as a gritty, foreign-body sensation
- Dryness, since the raised tissue disrupts the normal tear film
- Blurred or distorted vision from corneal shape changes
Symptoms tend to flare in windy, dry, or dusty conditions and during prolonged sun exposure.
Non-Surgical Treatment
For pterygia that are small and not affecting vision, the standard approach is conservative management. Lubricating eye drops (artificial tears) help with dryness and the gritty feeling. Over-the-counter eye ointments can also soothe irritation. If inflammation flares up significantly, a short course of steroid eye drops may be prescribed to bring it under control. These treatments don’t shrink or remove the pterygium. They manage symptoms while your eye doctor monitors the growth over time.
When Surgery Is Recommended
The American Academy of Ophthalmology lists four main reasons to operate: astigmatism significant enough to impair vision, the growth threatening to cover the visual axis (the center of the cornea over the pupil), severe ongoing irritation that doesn’t respond to drops, and cosmetic concern. There’s no universal consensus on exactly when to intervene, so the decision involves weighing how much the pterygium is affecting your daily life and how quickly it’s progressing.
Surgical Techniques and Recurrence
The simplest approach, called the bare sclera technique, involves removing the pterygium and leaving the underlying white of the eye exposed to heal on its own. It’s fast, but it carries the highest recurrence rate, around 38 percent in comparative studies. The growth comes back because the bare area can trigger the same abnormal healing process that caused the original pterygium.
The preferred method today is conjunctival autografting. After removing the pterygium, the surgeon takes a thin piece of healthy conjunctival tissue from another part of your eye (usually the upper area, hidden under the eyelid) and stitches or glues it over the bare spot. This technique has a recurrence rate of roughly 17 percent, less than half that of the bare sclera method. The trade-off is a longer procedure and a slightly more involved recovery, but cosmetic and surgical outcomes are generally superior.
Some surgeons use an anti-scarring medication applied during surgery to further reduce recurrence. This approach showed a 25 percent recurrence rate in the same comparative data, placing it between the other two techniques.
What Recovery Looks Like
Expect your eye to be noticeably sore for about a week after surgery. Redness typically takes two to three weeks to clear, and your vision may stay somewhat blurry for up to six weeks before settling back to its pre-surgery baseline. Most people plan for about two weeks off work, though this varies depending on your job and how much dust or screen time it involves.
You’ll use antibiotic drops to prevent infection and likely continue lubricating drops afterward, since the eye surface may not be perfectly smooth right away. In some cases, a laser treatment can be used later to smooth any remaining irregularities on the corneal surface.
Preventing Pterygium
Since UV exposure is the primary cause, protecting your eyes from sunlight is the single most effective prevention strategy. Sunglasses that block 100 percent of both UVA and UVB rays are essential, especially if you spend time outdoors in bright or reflective environments. Wraparound styles offer better coverage by blocking light that enters from the sides. A wide-brimmed hat adds another layer of protection by shading your eyes from above.
Beyond UV protection, keeping your eyes lubricated in dry, windy, or dusty conditions helps reduce the chronic irritation that contributes to pterygium formation. Artificial tears are inexpensive and available over the counter. Protective goggles during dusty outdoor work or watersports are also worth considering. If you already have a small pterygium, these same habits can help slow its progression.