Pterygium surgery is an outpatient procedure that removes a wedge-shaped growth of tissue from the surface of the eye. The growth, called a pterygium, starts on the white of the eye and can slowly creep onto the cornea, the clear window over your iris and pupil. Surgery typically takes 20 to 40 minutes under local anesthesia, and most people can see well enough to read or drive within a day or two afterward.
Why Surgery Is Recommended
A pterygium doesn’t always need to be removed. Small, stable growths that aren’t causing symptoms can often be managed with lubricating drops or mild anti-inflammatory drops. Surgery becomes the preferred option when the growth starts interfering with your life or your vision in specific ways: it encroaches on your visual axis (the central line of sight), causes persistent redness or irritation that doesn’t respond to drops, creates enough irregular astigmatism to blur your vision, or restricts how freely your eye can move. Some people choose surgery primarily for cosmetic reasons, especially if the growth is large and visibly noticeable.
How the Procedure Works
All pterygium surgeries share the same first step: the surgeon carefully peels the growth off the cornea and removes it along with the affected conjunctiva (the thin membrane covering the white of the eye) and the tissue underneath. What happens next depends on the technique your surgeon uses, and this choice has a major impact on whether the pterygium comes back.
Bare Sclera Technique
The simplest approach is to remove the growth and leave the exposed white of the eye (the sclera) uncovered, allowing the surrounding tissue to heal over it naturally. This was once the standard method, but it carries the highest recurrence rate, with patients roughly six times more likely to see the pterygium return compared to graft-based techniques. It’s rarely recommended today as a standalone approach.
Conjunctival Autograft
This is now the most widely used technique. After removing the pterygium, the surgeon takes a thin patch of healthy tissue from under your upper eyelid and places it over the bare area. This graft acts as a barrier, reducing recurrence rates to as low as 5%. A variation called a limbal autograft includes stem cells from the edge of the cornea in the transplanted tissue, which has shown recurrence rates as low as 1% in some studies.
Amniotic Membrane Transplant
Instead of harvesting tissue from your own eye, the surgeon covers the exposed area with a piece of processed amniotic membrane (donor tissue from a human placenta). This option avoids creating a second wound site under your eyelid, which can be an advantage if you might need eye surgery in the future. Recurrence rates with amniotic membrane range from about 5% to 27%, generally higher than conjunctival autografts but far better than bare sclera excision alone.
Glue vs. Sutures
Once the graft is positioned, it needs to be held in place while it heals. Traditionally, surgeons used fine sutures to stitch the graft down. A newer alternative is fibrin glue, a biological adhesive that bonds the graft to the underlying tissue without stitches. Fibrin glue cuts average surgery time nearly in half, from roughly 41 minutes down to about 23 minutes. It also causes significantly less pain in the days following the procedure. Patients who receive glue report lower discomfort scores at both three and ten days after surgery compared to those with sutures. The trade-off is that fibrin glue costs more, and not every surgical center offers it.
What to Expect on Surgery Day
Pterygium removal is done as a same-day procedure, meaning you go home afterward. You’ll receive local anesthesia, typically an injection of numbing medication under the conjunctiva, so you’re awake but feel no pain during the operation. Some surgeons use a slightly deeper injection if the case is complex or if you’re likely to have trouble keeping your eye still.
Standard pre-operative instructions include fasting from food and drink (except small sips of water) after midnight the night before. You can take your regular daily medications with water that morning, with one key exception: if you take diabetes medication or insulin, you’ll skip it because of the fast. Bring those medications with you so you can take them once you’re cleared to eat again. You’ll also need someone to drive you home.
Recovery Timeline
Your eye will be patched after surgery, and you can remove the patch after a few days. Vision clears quickly. Most people can see well enough to work on a computer, read, or drive by the next day, though your sight will continue to sharpen over the following weeks as the surface of the eye heals.
Redness is the most visible part of recovery. Expect your eye to look noticeably red and possibly swollen for several weeks. It takes at least a month for the eye to look normal and healthy again, and for some people it stretches to two months. If you had sutures, your surgeon will remove them at a follow-up visit shortly after surgery. You’ll use prescription eye drops (typically a combination to reduce inflammation and prevent infection) for several weeks during healing.
There are a few restrictions to keep in mind. Avoid getting water directly in your eye for at least a month, which means no swimming and care in the shower. Hold off on contact sports or any high-impact activity until your doctor clears you. Most people find the first week the most uncomfortable, with scratchiness and mild pain that gradually fades.
Risks and Complications
Pterygium surgery is considered low-risk, and serious complications are uncommon. In a large retrospective study of over 2,300 procedures, graft displacement occurred in about 0.4% of cases. Small inflammatory bumps called granulomas formed at the surgical site in roughly 0.2% of patients. Rarer but more serious complications include thinning of the cornea or sclera from the dissection, accidental injury to an eye muscle, or a small tear in the graft during placement. These intraoperative problems are infrequent and usually manageable when they occur.
The most common long-term concern isn’t a complication in the traditional sense: it’s recurrence. Even with the best techniques, a pterygium can grow back. Recurrence tends to happen relatively early. In one study of recurrent cases treated with large conjunctival autografts, the average time to regrowth was about 7.5 weeks, with an overall recurrence rate of 4%. Younger patients and those living in high-UV environments face higher odds of regrowth. If a pterygium does return, it can be removed again, often with additional measures like a limbal autograft to further reduce the chances of yet another recurrence.
Choosing a Surgical Technique
For most patients having a pterygium removed for the first time, conjunctival autograft with either fibrin glue or sutures is the current gold standard. It offers the lowest recurrence rates with a well-established safety record. Amniotic membrane transplant is a reasonable alternative, particularly for people who may need future glaucoma surgery or other procedures that require intact conjunctival tissue under the upper eyelid. Bare sclera excision on its own is largely outdated because of its high recurrence rate, though it may still be combined with other treatments like anti-scarring agents in certain situations.
Your surgeon will recommend an approach based on the size and location of your pterygium, whether it’s a first-time or recurrent growth, and the condition of the surrounding tissue. If you have pterygia in both eyes, they’re typically operated on one at a time to allow each eye to heal fully before addressing the other.