If you have noticed a fleshy growth on the white part of your eye, persistent redness, irritation, or vision that seems more blurred than before, this page will help you understand what pterygium is, why it happens, how it is diagnosed, and when treatment may be recommended. A pterygium is a benign, wedge-shaped growth of tissue that starts on the conjunctiva and can extend onto the cornea.
What is Pterygium, and why it affects vision.
Common symptoms and how they often begin.
Possible causes, risks, factors, behaviours.
How doctors confirm the diagnosis.
What treatment options are available?
What results can you expect after treatment.
Overview
Pterygium is a raised, fleshy, usually wing-shaped growth that begins on the conjunctiva, the clear tissue covering the white part of the eye, and extends toward or onto the cornea. It most commonly appears on the side of the eye closest to the nose, although it can occur elsewhere and can affect one eye or both eyes. It is benign, meaning it is not a cancer.
Although pterygium is often small at first, it can become more noticeable over time. In more advanced cases, it can pull on the cornea, change its shape, cause astigmatism, create scarring, and reduce visual quality. In very severe cases, it may extend far enough to threaten the visual axis.
Symptoms
Some patients have few symptoms at first. Others feel irritation long before vision is affected.
If the growth changes the shape of the cornea, vision may become less sharp or more distorted. This can also change the glasses prescription.
Some patients are most concerned by the visible appearance of the growth, even if symptoms are otherwise mild.
Many people describe the eye as dry, scratchy, irritated, or as if something is stuck in it.
As a result of the chronic dry eye there is permanent irritation and redness, especially in wind, dust, or dry environments.
Causes
The strongest risk factor linked to pterygium is long-term exposure to ultraviolet light. It is more common in people who spend a lot of time outdoors and in people living in hot, dry, windy, dusty climates or closer to the equator. ELZA’s current pterygium page also describes the condition as directly related to lifelong UV exposure.
Wind, dust, dryness, and chronic surface irritation may also contribute. This is why eye protection and ocular surface care matter not only after treatment, but also as part of prevention and long-term management.
Protecting the eyes from UV light with proper sunglasses, and reducing exposure to wind and dust, may help lower risk and reduce recurrence after surgery.
This film by the European Sunglass Association was created with the collaboration of Prof. Hafezi from the ELZA Institute and explains the effect of too much sunlight on the eye. In addition to the conjunctiva, other structures of the eye may suffer, such as the human eye lens or even the retina
Prevention and long-term care matter both before and after treatment. The most important measures are reducing UV exposure, using proper sunglasses, protecting the eyes in dusty or windy environments, and keeping the ocular surface well lubricated when dryness is a problem.
This is especially relevant after surgery, because recurrence is one of the main long-term concerns. Patients should understand that surgical success is not only about the day of the operation, but also about follow-up, healing, and ongoing protection of the ocular surface.
Diagnosis
Diagnosis is usually straightforward during an eye examination. A specialist examines the front of the eye with a slit lamp, a microscope that allows close inspection of the conjunctiva, cornea, and tear film. In most cases, this is enough to confirm the diagnosis and assess how far the pterygium has extended.
The doctor asks about redness, dryness, irritation, visual change, sun exposure, and how long the growth has been present. This is a reasonable clinical inference from patient assessment and is consistent with the symptoms emphasized in patient guidance.
The pterygium is examined directly to determine size, location, inflammation, and how much it affects the cornea.
If vision is affected, the doctor assesses whether the pterygium is changing the corneal surface or contributing to astigmatism or scarring.
A detailed map of the cornea’s, its epithelium and thickness is created. We use the most modern variant, combining optical coherence tomography (OCT) and placido-based measurements (MS-39).
Treatment
Treatment depends on size, symptoms, effect on vision, growth over time, and how much the pterygium is disturbing the surface of the eye. Not every patient needs surgery. Many patients begin with symptom control and monitoring.
Outcomes
Many patients do very well after treatment, especially when surgery is performed for the right reasons and followed by proper aftercare. Benefits may include less irritation, a whiter and calmer eye, improved comfort, and in some cases better visual quality if the pterygium was distorting the cornea. This is an inference based on the treatment goals described in patient and clinic guidance.
After
Before
Why us?
Pterygium may look simple from the outside, but good treatment depends on more than removing visible tissue. The specialist needs to assess how much the growth is affecting the tear film, corneal surface, and vision, and whether surgery is likely to improve comfort, appearance, or visual quality.
ELZA is as a boutique Swiss clinic with a global footprint in modern eye care, strong corneal expertise, and international-patient care and online video consultations. Our Chief Medical Officer, Prof. Farhad Hafezi ranks in the top 0.056% of published authors worldwide on cornea in Expertscape’s ranking.
Pterygium treatment benefits from strong experience with the corneal surface, not only basic excision.
ELZA highlights published expertise and international reputation in cornea and ophthalmology.
ELZA offers dedicated pathways for international patients and online video consultations.
FAQs
Usually not. Pterygium is benign, and many cases stay relatively small. But it can become bothersome, affect vision, or scar the cornea if it keeps growing.
No. Many patients are managed with observation, lubricants, and treatment of irritation. Surgery is recommended only when symptoms, growth, vision, or appearance justify it.
Yes. If it pulls on the cornea or grows farther onto it, it can cause astigmatism, blur, distortion, or scarring.
Yes. Recurrence is one of the main risks after surgery, often within the first year.
Use sunglasses with UV protection, protect the eyes from wind and dust, and keep the eye surface lubricated if dryness is an issue.
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