A keratectomy is a surgical procedure that removes damaged or diseased tissue from the surface of the cornea, the clear front window of your eye. Unlike a corneal transplant, which replaces corneal tissue with donor tissue, a keratectomy simply takes away the problematic layers to restore a smoother, clearer surface. It’s used to treat a range of conditions that affect the front of the cornea, from recurring erosions and corneal scars to raised nodules that distort vision.
How the Cornea Is Involved
Your cornea has several distinct layers, and keratectomy targets only the outermost ones. The procedure typically involves removing the epithelium (the thin outer skin of the cornea), Bowman’s layer (a tough membrane just beneath it), and sometimes a thin portion of the stroma, the thicker structural layer underneath. Because keratectomy stays in these superficial zones, it avoids disturbing the deeper corneal architecture. Scars, deposits, or abnormal growths that sit within the first 100 micrometers or so of the cornea are good candidates for this approach.
Types of Keratectomy
There are two main approaches, distinguished by how the tissue is removed.
Superficial keratectomy is done by hand. The surgeon works under a microscope, using a surgical blade, diamond burr, or specialized scrubber to peel, shave, or polish away the affected tissue. For conditions like Salzmann’s nodular degeneration, forceps are used to grip the edge of a raised nodule and lift it off. For dystrophic tissue, a blunt blade or sponge is used to separate the lesion from the healthy layer beneath it in one smooth plane.
Phototherapeutic keratectomy (PTK) uses an excimer laser instead of a blade. The laser delivers a precise ultraviolet beam that vaporizes tissue in controlled, microscopic layers. This allows extremely even removal across the treatment zone, which is typically 6 to 6.5 millimeters wide. PTK is especially useful when the goal is to smooth out an irregular surface, because the laser can remove tissue uniformly in a way that’s difficult to achieve by hand.
Both approaches are performed as outpatient procedures under local anesthesia, usually numbing eye drops. The choice between them depends on the specific condition, the depth and shape of the abnormality, and the surgeon’s preference.
Conditions Treated With Keratectomy
Keratectomy is not a vision-correction procedure like LASIK. It’s a therapeutic surgery aimed at corneal disease. The most common reasons it’s performed include:
- Recurrent corneal erosion: A painful condition where the surface layer of the cornea repeatedly peels away, often triggered by a prior injury or an underlying condition called epithelial basement membrane dystrophy. Keratectomy removes the loose, poorly anchored epithelium so a healthier layer can regrow.
- Salzmann’s nodular degeneration: Raised, bluish-white nodules that form on the corneal surface. These can blur vision by creating irregular astigmatism or by sitting directly in the line of sight. The nodules are peeled or shaved off during keratectomy.
- Superficial corneal scars: Scars from infection, injury, or inflammation that sit in the front layers of the cornea and interfere with clarity. PTK or manual keratectomy can remove these scars, provided they don’t extend too deep into the stroma.
- Corneal dystrophies: Genetic conditions that cause abnormal material to accumulate in the cornea. When the deposits are limited to the surface layers, keratectomy can clear them away and improve both comfort and vision.
What to Expect During the Procedure
Keratectomy is typically quick, often taking less than 30 minutes per eye. You’ll receive numbing drops, and in some cases a slightly deeper local anesthetic injection around the eye. You stay awake throughout, but you won’t feel sharp pain.
If you’re having manual superficial keratectomy, the surgeon works under an operating microscope, carefully dissecting and removing the targeted tissue layer by layer. For PTK, you’ll be asked to look at a fixation light while the laser works. The surgeon monitors the surface through the microscope and may apply a thin gel layer partway through to help the laser smooth out remaining irregularities evenly.
At the end of the procedure, antibiotic drops are applied and a bandage contact lens is placed on the eye. This lens has no prescription. It acts as a protective shield while the surface epithelium regrows.
Recovery and Healing Timeline
The first few days after keratectomy are the most uncomfortable. Your eye will water heavily, feel gritty or sore, and be sensitive to light. Most people find that by day three or four, the discomfort drops significantly and the constant tearing stops.
At your one-week follow-up, the bandage contact lens is typically removed. Vision at that point varies widely. Some people already see 20/20, while others may be around 20/50 or 20/60. Both outcomes are normal. Activity restrictions, including swimming and contact sports, are generally lifted after that first week.
The corneal surface continues to remodel for months. The epithelium gradually thickens over the first 12 months, and the underlying tissue goes through a wound-healing process that can cause temporary haziness. This haze usually clears on its own as the epithelial basement membrane rebuilds and the cornea regains its transparency, a process that can take several weeks to several months. Final visual results often aren’t apparent until around three months after surgery, and some patients end up with vision slightly better than 20/20.
Post-Operative Medications
After keratectomy, you’ll use several types of eye drops on a schedule. Antibiotic drops are used about four times daily for the first week to prevent infection. Lubricating drops (preservative-free artificial tears) are used frequently, often for up to three months, to keep the healing surface moist. Anti-inflammatory steroid drops are used for roughly a month and then gradually tapered over the following month to control the healing response and reduce the risk of haze. You may also take oral anti-inflammatory medication for the first few days to manage pain.
Risks and Complications
The most common issue after keratectomy is corneal haze, a mild cloudiness that develops as part of the wound-healing response. Haze is more likely when deeper tissue removal is needed, and it usually resolves over several months as the cornea heals. To reduce haze risk, surgeons sometimes apply a medication called mitomycin C to the corneal surface during the procedure, or place an amniotic membrane graft to support smoother healing.
Delayed visual recovery is also common and expected. Because the surface needs time to fully regenerate and stabilize, your vision may fluctuate for weeks before settling. Other possible complications include delayed healing of the surface epithelium and, rarely, infection. The risk of significant scarring is low, particularly with PTK.
Keratectomy vs. Corneal Transplant
Keratectomy and keratoplasty (corneal transplant) are fundamentally different procedures. Keratectomy removes tissue. Keratoplasty removes tissue and replaces it with donor corneal tissue. In conditions like Salzmann’s nodular degeneration, research comparing the two approaches has found that keratectomy achieves similar visual improvement at six months while causing fewer complications and faster surface healing. Transplant carries additional risks, including graft rejection, interface infection, and high residual astigmatism.
For this reason, keratectomy is often tried first when the problem is limited to the front layers of the cornea. If the disease extends deeper into the stroma or affects the full thickness of the cornea, transplant becomes the more appropriate option. Keratectomy, in this sense, plays a transplant-sparing role: it can resolve many surface-level problems without the complexity and long recovery of a graft.