Keratoconus treatment follows a stepwise approach, starting with glasses or contact lenses in mild cases and progressing to procedures like collagen cross-linking or corneal transplantation as the disease advances. The right treatment depends on how far the condition has progressed and whether your cornea is still changing shape.
How Keratoconus Is Diagnosed
Keratoconus causes the cornea to thin and bulge into a cone-like shape, distorting vision. Diagnosis relies on corneal topography, a painless imaging scan that maps the surface curvature of your eye. Several measurements help confirm the diagnosis: a central corneal steepness greater than 48.7 diopters, an inferior-superior asymmetry index above 1.2 diopters, astigmatism exceeding 2.5 diopters, or posterior elevation above 18 to 20 microns. A milder form called forme fruste keratoconus can be detected at steepness values between 47.2 and 48.7 diopters, even before symptoms are obvious.
Your doctor will also measure corneal thickness, which plays a direct role in determining which treatments are safe for you. These scans are repeated over time to track whether the cornea is still changing, because progression is the key factor that drives treatment decisions.
Glasses and Standard Contact Lenses
In the earliest stages, when the cornea has only mild irregular astigmatism, glasses can correct vision adequately. This is often the starting point for people diagnosed young, before significant thinning has occurred. As the cornea becomes more irregular, glasses lose their effectiveness because they can only correct uniform refractive errors, not the complex distortions keratoconus creates. At that point, contact lenses become the primary tool for managing vision.
Specialty Contact Lenses
Contact lenses for keratoconus aren’t the same soft lenses most people wear. The two main options are rigid gas permeable (RGP) lenses and scleral lenses, and they work differently.
RGP lenses sit directly on the cornea and provide sharp vision by masking its irregular surface with a smooth, rigid front. They’re easier to handle and have a simpler fitting process with fewer follow-up visits. The trade-off is comfort: many people experience a foreign body sensation, especially early on, and the lenses can feel dry after prolonged wear.
Scleral lenses are larger and vault over the entire cornea, resting on the white part of the eye (the sclera) instead. A layer of saline fluid fills the space between the lens and the cornea, creating a smooth optical surface while keeping the eye hydrated all day. Because they bypass the sensitive cornea entirely, scleral lenses tend to feel comfortable from the start. They also correct higher-order visual distortions more completely than RGP lenses, which can leave some aberrations unresolved. The downside is a steeper learning curve for insertion and removal, though most people master the technique within a few weeks.
For many people with moderate keratoconus, specialty lenses provide excellent functional vision and remain the mainstay of treatment for years.
Collagen Cross-Linking to Stop Progression
Collagen cross-linking (CXL) is the only treatment that addresses the underlying problem: a cornea that’s still getting weaker and changing shape. The procedure strengthens the cornea by creating new chemical bonds between its collagen fibers, essentially stiffening the tissue to slow or halt progression.
CXL is recommended for people with progressive keratoconus who still have a clear cornea and a minimum corneal thickness of 400 micrometers. The standard approach, called “epi-off” CXL, involves removing the thin outer layer of the cornea (the epithelium), applying riboflavin (vitamin B2) drops, and then exposing the cornea to ultraviolet light. Recovery takes several days as the epithelium heals, and vision may be blurry during that period.
Long-term data shows the procedure is effective. Studies tracking patients for 7 to 10 years report corneal stabilization in 76% to 100% of treated eyes, depending on the study. A large follow-up of two patient groups found that 82% of keratoconus eyes remained stable at 10 years. CXL doesn’t reverse the cone shape or eliminate the need for glasses or contacts, but it can prevent the disease from getting worse, which is especially valuable for younger patients whose keratoconus is more likely to progress.
Corneal Ring Segments
Intrastromal corneal ring segments (often called by the brand name Intacs) are small, curved plastic inserts placed within the cornea to flatten its shape and reduce the cone. They’re an option for people whose vision isn’t adequately corrected by contact lenses but who aren’t yet candidates for a transplant.
The procedure is done under local anesthesia and takes about 15 minutes. In FDA-reviewed clinical trials, 62% to 78% of treated eyes gained two or more lines of uncorrected visual acuity, and 45% to 62% gained two or more lines of best corrected acuity. Those are meaningful improvements for daily tasks like driving or reading.
Complications are relatively uncommon but worth knowing about. Across the studies, about 4% to 6% of patients lost two or more lines of vision. Around 12% to 16% reported bothersome visual symptoms like glare, difficulty with night vision, or fluctuating vision, and some of those patients chose to have the inserts removed. The inserts are reversible, meaning they can be taken out if problems arise, which is a significant advantage over permanent procedures.
Corneal Transplantation
When contact lenses, cross-linking, and ring segments aren’t enough to maintain functional vision, corneal transplantation becomes the next step. About 10% to 20% of people with keratoconus eventually need a transplant. There are two main approaches.
Penetrating keratoplasty (PK) replaces the full thickness of the cornea with donor tissue. It has decades of track record and generally produces good visual outcomes for keratoconus, which has one of the highest transplant success rates of any corneal condition. Recovery is slow, though. Sutures typically stay in for 12 to 18 months, and final vision may not stabilize for a year or more. You’ll likely still need glasses or contacts afterward.
Deep anterior lamellar keratoplasty (DALK) replaces only the front layers of the cornea while preserving your own inner layer (the endothelium). The theoretical advantage is a lower risk of the most serious type of graft rejection, since the endothelium is the layer most vulnerable to immune attack. Short-term randomized trials show no difference in graft survival between the two techniques, and a report from the American Academy of Ophthalmology concluded that DALK is equivalent to PK in terms of survival. However, longer-term data pooled from multiple centers has actually shown slightly worse survival for DALK grafts in keratoconus, so the picture is more nuanced than a simple “newer is better” assumption.
Your surgeon’s experience with each technique matters as much as the technique itself. DALK is more technically demanding, and outcomes depend heavily on the surgeon’s skill in separating the corneal layers cleanly.
Slowing Progression on Your Own
One of the most actionable things you can do is stop rubbing your eyes. Eye rubbing is one of the leading risk factors for both developing and worsening keratoconus. Research has found it to be the most common risk factor among keratoconus patients, affecting nearly 45% of those studied. The mechanical trauma from aggressive or repeated rubbing directly weakens corneal tissue.
Allergies are a major driver of eye rubbing, so treating the itch at its source helps. If you have seasonal or chronic eye allergies, using antihistamine drops or allergy medications consistently can reduce the urge to rub. For people who rub their eyes out of habit, especially at night, awareness is the first step. Some doctors recommend wearing sleep masks or keeping hands busy to break the cycle.
Beyond rubbing, there’s no proven diet or supplement that slows keratoconus. The most important lifestyle factor is attending regular follow-up appointments so your doctor can catch progression early, when cross-linking is still an option, rather than after significant vision loss has already occurred.