Pterygium: Causes, Symptoms, and Treatment

The main cause of pterygium is prolonged, cumulative exposure to ultraviolet rays from the sun, which damages the delicate surface of your eye over time. Other major contributing factors include living or working in dry, windy, or dusty environments, as these conditions constantly irritate your eyes and promote abnormal tissue growth. People who spend significant time outdoors without proper eye protection, whether for work or recreation, face the highest risk of developing pterygium throughout their lifetime.

People living in the pterygium belt, which extends approximately 30 to 40 degrees north and south of the equator, have much higher rates of this condition due to intense, year-round sun exposure. In these regions, pterygium can affect anywhere from 2% to 30% of the population. Coastal areas and regions with strong winds and reflected sunlight from water, sand, or snow also significantly increase risk. Those who work outdoors, such as farmers, construction workers, landscapers, fishermen, and surfers, develop pterygium far more often than people with primarily indoor occupations.

Men tend to develop pterygium more often than women, possibly due to higher rates of outdoor work and less consistent use of sun protection. The condition most commonly appears in adults between 20 and 50 years old, though it can develop at any age with sufficient sun exposure. People with light-colored eyes may be slightly more susceptible to UV damage. While a family history can play a small role, environmental factors remain the overwhelming cause, and protective measures are far more important than genetic predisposition.

Using preservative-free artificial tears several times throughout the day keeps your eyes moist and reduces the gritty, scratchy feeling that pterygium often causes. Avoid rubbing your eyes, even when they feel irritated, as this only increases inflammation and discomfort. Applying a cool, damp cloth over your closed eyes for a few minutes can provide soothing relief when symptoms flare up. If you smoke, quitting is strongly encouraged, as smoking worsens eye surface irritation and may accelerate pterygium growth.

If you work outdoors or spend time in windy conditions common in the Bloomfield and Greater Hartford area, wear wraparound safety glasses or sunglasses to protect your eyes from wind, dust, pollen, and harmful UV rays. Taking regular breaks in shaded or indoor areas also helps. At home or in the office, using a humidifier combats dry air, especially during Connecticut's cold, dry winter months. When doing activities like gardening, yard work, or cleaning, wear protective eyewear to shield your eyes from debris and irritants that can worsen symptoms.

If pterygium begins to affect your vision, ensure you have adequate lighting when reading or doing close-up work to reduce eye strain. Keep your glasses or contact lens prescription up to date, as the growth can gradually change your vision needs by causing astigmatism or corneal distortion. If glare from headlights or streetlights makes driving at night difficult or uncomfortable, discuss treatment options with our ophthalmologists promptly, as this may indicate that the pterygium is significantly affecting your vision quality.

No, a pterygium is completely benign and non-cancerous. It will not spread to other parts of your body or transform into cancer. However, because very rare cancerous growths on the eye can sometimes resemble a pterygium, it is essential to have any new or changing growth evaluated by our ophthalmologists to ensure an accurate diagnosis and appropriate care.

A pterygium will not disappear on its own once it has formed. Without surgical removal, it will either remain stable in size or continue to grow slowly over time. Many small, stable pterygia that do not cause symptoms can be successfully managed with protective measures like sunglasses and lubricating drops without requiring surgery, but the growth itself will remain present.

Recurrence rates depend heavily on the surgical technique used. With modern surgery that includes a conjunctival autograft, the recurrence rate is low, typically around 5% to 10%. Older techniques that left the surgical area bare had much higher recurrence rates, sometimes exceeding 40%. Strictly following your post-operative instructions, especially regarding prescribed eye drops and sun protection during healing, is critical to preventing regrowth.

A pinguecula is a yellowish, slightly raised bump that forms on the white part of the eye but does not grow onto the clear cornea. A pterygium is a more aggressive, fleshy, vascular growth that does cross from the white part onto the cornea and can therefore directly affect your vision. Both conditions are caused by similar environmental factors like sun exposure, but pterygium is considered more serious due to its potential to impact sight and cause greater discomfort.

Yes, it is quite common for pterygium to develop in both eyes, a condition called bilateral pterygium, especially in people with high cumulative sun exposure. The growths may appear at different times and grow at different rates in each eye. Even if only one eye currently shows signs of pterygium, both eyes share the same risk factors and should be protected with sunglasses and monitored regularly during comprehensive eye exams.

Many patients with small pterygia can continue to wear contact lenses, but you may experience increased dryness, irritation, or a persistent foreign body sensation. The raised growth can also affect the way the lens fits on your eye, causing discomfort or movement of the lens. Soft contact lenses are generally better tolerated than rigid gas permeable lenses. If you experience significant discomfort, our ophthalmologists may recommend specific lens types designed for sensitive eyes, more frequent use of lubricating drops, or temporarily switching to glasses.

No, treatment is only necessary when the pterygium causes persistent irritation not adequately relieved by lubricating drops, begins to affect your vision by causing astigmatism or growing near the pupil, limits your ability to wear contact lenses comfortably, or when its appearance is a cosmetic concern. Many small, stable pterygia only require regular monitoring during routine eye exams to watch for any signs of progression.

Pterygium is very rare in children but can occur, especially in regions with intense sun exposure or in children who spend extensive time outdoors without adequate eye protection. Because the condition develops from cumulative UV damage over many years, it is far more common in adults. Protecting children's eyes with properly fitted sunglasses and wide-brimmed hats from a young age is the best way to prevent pterygium from forming later in life.

While pterygium rarely causes complete blindness, it can lead to permanent vision impairment if allowed to grow unchecked across the cornea. If it covers the central visual axis or causes significant corneal scarring, irregular astigmatism, or distortion before it is removed, some vision changes may persist even after successful surgery. This is why timely evaluation and treatment are important if you notice a pterygium is progressively growing or affecting your vision.

While some research suggests a minor genetic predisposition may exist, environmental factors are overwhelmingly the primary cause of pterygium. Your most significant risk is not what you inherit genetically, but rather where you live, work, and how much UV exposure your eyes receive throughout your lifetime. Having a family member with pterygium often indicates a shared high-exposure environment or similar outdoor lifestyle rather than a direct genetic link passed down through families.

No specific vitamin or supplement has been proven to cure, shrink, or prevent pterygium. However, nutrients that support overall ocular surface health, such as omega-3 fatty acids found in fish oil, may help manage the dryness and irritation often associated with the condition. Maintaining a balanced, nutritious diet and good hydration supports general eye health but cannot substitute for medical treatment, proper UV protection, or regular eye examinations.

Yes, pterygium can impact both depth perception and night vision. By inducing irregular astigmatism and distorting the cornea's smooth surface, a pterygium reduces the clarity and precision of your vision, which can in turn affect depth perception and your ability to judge distances accurately. It can also cause increased glare, halos, and starbursts around lights, symptoms that are especially noticeable and disruptive when driving at night. Surgical removal often improves or completely resolves these symptoms.

Surgery remains the only definitive way to remove a pterygium. However, research is ongoing into new medical therapies. Some studies are exploring medications that could inhibit the specific growth factors responsible for pterygium formation and recurrence, potentially reducing the need for surgery or preventing regrowth after removal. At present, these approaches are still experimental and not yet available for general clinical use.