Noticed a strange growth on the white of your eye? There’s no need to panic. That bump on your eyeball is likely caused by a pinguecula or a pterygium, two of the most common eye growths seen by optometrists, particularly in sun-drenched countries like Australia. They look similar, they share the same main cause, but they behave very differently.
Here's how to tell them apart and what you should do about it.
Quick Takeaways
- A pinguecula is a small, yellow-white bump on the white of your eye that stays put and rarely threatens your vision
- A pterygium is a fleshy, wedge-shaped growth that can spread onto your cornea and affect how you see
- Both are triggered primarily by UV exposure, which is why they're so prevalent in Australia
- A pinguecula can turn into a pterygium if exposure to UV light continues unchecked
- Both are benign, but any new or changing growth should be professionally assessed
What Is a Pinguecula?
A pinguecula (pronounced pin-GWEK-yoo-la) is a raised, yellowish or whitish deposit that forms on the conjunctiva (the thin, clear tissue covering the white part of your eye). It typically shows up at the inner corner of the eye, closest to the nose, though it can appear on the outer side as well.
These deposits are made up of protein, fat, or calcium that accumulates in the conjunctival tissue over time. They don't grow onto the cornea (the clear dome at the front of your eye), and in most cases, they cause no vision problems at all. You might not even know it's there until you look closely in a mirror or your optometrist spots it during a routine eye test.
That said, a pinguecula can still make itself known. Common symptoms include:
- A gritty or sandy feeling in the eye
- Redness or mild irritation, especially in dry or windy conditions
- A visible yellowish bump that looks a little like a small blister
- Occasional dryness or burning
Symptoms often flare up after extended time outdoors, in dusty environments, or in air-conditioned spaces. Lubricating eye drops (like Hylo Forte, a preservative-free drop well suited to dry or irritated eyes) can help manage the discomfort when it kicks in.
What Is a Pterygium?
A pterygium (pronounced teh-RIJ-ee-um) is a step up in seriousness. It's a fleshy, triangular or wedge-shaped growth with its own blood vessels, which is why it often looks pinkish or red rather than the pale yellow of a pinguecula. Unlike a pinguecula, a pterygium doesn't stay neatly on the white of the eye. It grows.
Over time, a pterygium spreads from the conjunctiva onto the cornea. This is where things can get problematic. As the growth creeps towards the centre of your eye, it starts to distort the shape of the cornea, potentially causing:
- Blurred or distorted vision
- A new or worsening astigmatism
- Persistent redness and irritation
- A constant "foreign body" sensation, like something's stuck in your eye
- In advanced cases, partial blocking of the line of sight
Pterygium is sometimes called "surfer's eye," given how frequently it develops in people who spend long hours in intense UV and reflective-surface environments. But you don't need to be a surfer to develop one. Farmers, tradespeople, and anyone who works outdoors regularly in Australia is at a higher risk.
Pinguecula vs Pterygium: Key Differences
|
Pinguecula |
Pterygium |
|
|
Appearance |
Yellow-white, raised bump |
Fleshy, pink-red, triangular |
|
Blood vessels |
Usually no prominent growth-related vessels |
Yes |
|
Location |
Stays on the conjunctiva |
Grows onto the cornea |
|
Effect on vision |
Rarely |
Yes, if it reaches the cornea |
|
Growth rate |
Slow or static |
Can grow, especially with UV exposure |
|
Surgery needed? |
Rarely |
Sometimes, if vision is affected |
What Causes Them and Why Australia Is a High-Risk Zone
Both conditions are primarily caused by cumulative UV radiation exposure. This is compounded by dry conditions, dust, and wind, all common across much of the country. According to published research, pterygium occurs in around 3% of Australians, though that rate rises significantly with age and outdoor exposure, reaching as high as 12% in men over 60.
Sydney's latitude puts it squarely in the zone for elevated UV risk, and UV levels here are regularly classified as extreme by the Bureau of Meteorology during summer months. You don't need decades on the beach for the damage to add up; it accumulates gradually from everyday outdoor activity.
Other contributing factors include:
- Spending significant time outdoors without UV-protective eyewear
- Living or working in dusty, windy, or dry environments
- Having lighter-coloured eyes (some evidence suggests greater UV sensitivity)
- Being over 40 (though younger Australians are not immune)
Can a Pinguecula Turn Into a Pterygium?
Yes. With continued UV exposure and irritation, a pinguecula can develop into a pterygium over time. The two conditions are related; a pterygium may actually begin as a pinguecula before the tissue becomes vascularised (develops blood vessels) and starts advancing onto the cornea.
This progression is another reason why early assessment and routine eye examinations are so important. Catching a pinguecula early gives you the best chance of keeping it stable with simple management strategies.
How to Tell Which One You Have
Honestly? It can be difficult to tell just by looking in the mirror, especially in the early stages. A few rough guides:
- If the bump is small, pale yellow, and sits only on the white of your eye, it's more likely a pinguecula
- If the growth has a pinkish tint, has visible blood vessels running through it, or appears to be extending toward the dark part of your eye, it's more likely a pterygium
- If you're noticing changes to your vision alongside the growth, see an optometrist promptly
The only reliable way to know is through a proper slit-lamp examination by an optometrist. They can also use corneal topography to assess whether the growth is affecting the shape of your cornea, something that's invisible to the naked eye.
When Should You See an Optometrist?
For a pinguecula, monitoring is often sufficient. But book an appointment if:
- The bump is growing noticeably
- You're experiencing persistent redness, irritation, or discomfort that lubricating drops don't relieve
- You're not sure whether it's a pinguecula or a pterygium
For a pterygium, see an optometrist sooner rather than later, especially if:
- The growth appears to be moving towards the pupil
- You're noticing any change in your vision
- The eye is consistently red or uncomfortable
- You've had it previously treated, and it seems to be returning
Surgical removal is an option for pterygia that are growing, causing vision problems, or are significantly uncomfortable. For pingueculae, surgery is rarely recommended. Symptom management and UV protection are usually enough.
Protecting Your Eyes Going Forward
Whether you've already developed one of these growths or are trying to prevent them, UV protection is the single most effective step you can take. The Australian Cancer Council recommends UV-protective eyewear whenever UV levels reach 3 or higher, which in Sydney means year-round.
Look for sunglasses that meet the Australian/New Zealand Standard AS/NZS 1067 and carry a UV400 rating. Wraparound styles offer better side coverage, which matters because UV exposure from angles is a genuine factor in conjunctival damage. Polarised lenses are particularly useful for reducing glare from reflective surfaces like water and roads.
A wide-brimmed hat adds another layer of protection, particularly in peak UV hours between 10am and 2pm.
City Optics stocks a wide range of sunglasses in Penrith that combine proper UV protection with optical-quality lenses, because protection and style aren't mutually exclusive.
See an Optometrist at City Optics
If you've noticed a bump on your eye or are due for a routine check, the team at City Optics can properly assess it. A thorough eye examination will tell you exactly what you're dealing with and the best path forward, whether that's simple monitoring, dry eye management, or a referral for treatment.
Contact City Optics to book your appointment today.