A pterygium (pronounced ter-IJ-ee-um) is a raised, fleshy growth on the clear membrane covering the white of your eye. It typically starts in the inner corner of the eye, near the nose, and slowly grows outward in a triangular or wing-shaped pattern toward the colored part of the eye. The name comes from the Greek word for “wing.” You may also hear it called surfer’s eye, since it’s strongly linked to time spent outdoors in sun, wind, and dry conditions.
Most pterygia are harmless and never need treatment. But in some cases the growth keeps expanding, eventually reaching the cornea and distorting vision. Understanding what drives that progression, and what can be done about it, helps you decide when to simply monitor it and when to act.
What It Looks Like
A pterygium appears as a slightly raised wedge of tissue on the white of the eye. It can look whitish, pinkish, or faintly red, and you can often see tiny blood vessels running through it. The growth almost always begins on the nasal side (the corner closest to your nose) and fans outward toward the iris. In some people both eyes are affected.
A related but different condition called a pinguecula is a small yellowish bump on the same membrane. A pinguecula stays put on the white of the eye and contains deposits of protein, fat, or calcium. A pterygium, by contrast, is vascular tissue that can start as a pinguecula and then continue growing onto the cornea. If your bump is yellow, flat, and stable, it’s more likely a pinguecula. If it’s pinkish, fleshy, and spreading toward the center of your eye, it’s more likely a pterygium.
Causes and Risk Factors
Ultraviolet radiation is the primary driver. A large study examining more than 100,000 people in rural Australia found a strong positive correlation between local UV levels and pterygium prevalence, reinforcing the idea that cumulative sun exposure is the central cause. The condition is far more common in people who live near the equator or spend long hours outdoors, which is why it earned the nickname surfer’s eye.
UV light isn’t the only irritant. Chronic exposure to wind, dust, sand, and dry air also contributes. People who work outdoors without eye protection, including farmers, construction workers, fishers, and athletes, face higher risk. The growth tends to develop over years or decades of repeated exposure, so it’s more common in adults over 30.
Symptoms and Vision Effects
Many people with a small pterygium have no symptoms at all and only notice it because of its appearance. As the growth gets larger, though, it can cause a gritty or burning sensation, persistent redness, and a feeling that something is stuck in the eye. Dryness and mild irritation are common because the raised tissue disrupts the normal tear film across the surface of the eye.
The more serious concern is vision. When a pterygium grows far enough onto the cornea, it can physically pull and warp the corneal surface, creating irregular astigmatism. This distortion blurs your vision in a way that glasses may not fully correct. In rare cases, a very large pterygium can grow across the pupil and block the line of sight entirely. These vision-threatening scenarios are uncommon, but they’re the main reason eye care providers monitor the growth over time and may recommend removal.
Managing Symptoms Without Surgery
If your pterygium is small and not affecting your vision, treatment focuses on comfort. Lubricating eye drops (artificial tears) help with dryness and that gritty feeling, especially in windy or dusty environments. For flare-ups with redness and swelling, your eye care provider may prescribe a short course of anti-inflammatory drops to calm the irritation. These measures don’t shrink the growth, but they can keep it from bothering you day to day.
Many people live with a pterygium for years or even permanently without ever needing more than artificial tears. The key is monitoring: periodic eye exams let your provider measure whether the growth is advancing toward the center of your cornea or staying stable.
When Surgery Is Recommended
Surgery becomes an option when the pterygium threatens your vision, causes persistent discomfort that drops can’t control, or creates a cosmetic concern that significantly affects your quality of life. The procedure is done on an outpatient basis under local anesthesia and typically takes 30 to 45 minutes.
The simplest approach is bare sclera excision, where the surgeon removes the growth and leaves the underlying white of the eye exposed to heal on its own. This technique is fast but comes with a significant downside: recurrence rates range from 33% to 45%. The pterygium often grows back, sometimes more aggressively than the original.
Modern surgeons generally prefer a technique called conjunctival autograft. After removing the pterygium, the surgeon takes a thin piece of healthy tissue from another part of your eye (usually under the upper eyelid) and grafts it over the bare area. The graft is secured with tiny sutures or a tissue adhesive (essentially a biological glue), which tends to be more comfortable during recovery. This approach lowers recurrence rates dramatically, with most studies reporting figures between 3% and 11%. Some surgeons also use an amniotic membrane graft, sourced from a tissue bank, as an alternative covering. Amniotic membrane grafts work well but show slightly higher recurrence rates in head-to-head comparisons, roughly 9% to 11% versus 3% to 5% for conjunctival autografts in several studies.
Recovery After Surgery
Expect your eye to be red, watery, and sore for the first week or two. Most people use prescribed anti-inflammatory and antibiotic drops for several weeks to prevent infection and control swelling. The graft site usually heals within a month, though mild redness can linger for a few months as the new tissue settles in.
You’ll typically be asked to avoid swimming, dusty environments, and heavy physical activity for a couple of weeks. Many people return to desk work within a few days, but outdoor workers may need a longer break. Follow-up visits in the weeks and months after surgery let your provider check for signs of recurrence, which is most likely in the first year.
Reducing Your Risk
Because UV exposure is the biggest risk factor, protecting your eyes outdoors is the single most effective preventive step. Sunglasses that block 100% of both UVA and UVB rays are essential. Wraparound styles are better than standard frames because they block light entering from the sides. A wide-brimmed hat or visor adds another layer of shade.
If you work or play in windy, dusty, or sandy conditions, protective goggles shield your eyes from both UV and physical irritants. Keeping your eyes lubricated with artificial tears in dry or windy environments also helps maintain a healthy ocular surface. Taking breaks in shaded areas during peak sun hours (roughly 10 a.m. to 2 p.m.) limits cumulative exposure over time.
None of these measures guarantee you’ll never develop a pterygium, but they substantially lower the risk, especially if you live in a sunny climate or spend most of your working hours outdoors.