Keratoconus Treatment: From Glasses to Surgery
How Keratoconus Changes Your Vision Over Time
Keratoconus causes the cornea, the clear dome at the front of the eye, to gradually thin and bulge into a cone shape. This irregular shape distorts light as it enters the eye, making vision increasingly difficult to correct. Understanding how the disease progresses helps you and your care team make the right decisions at the right time.
The cornea normally has a smooth, rounded curve that helps focus light onto the retina at the back of the eye. In keratoconus, the structural proteins in the cornea weaken, causing it to slowly lose its round shape and bulge outward. This creates irregular astigmatism, a type of visual distortion that glasses often cannot fully correct.
- The cornea thins and develops an uneven, cone-like shape
- Irregular astigmatism makes vision blurry and distorted even with prescription lenses
- Both eyes are usually affected, though often to different degrees
- The condition typically begins in the teen years or early adulthood
Each case progresses at its own pace. Some patients experience slow, mild changes over many years, while others progress more rapidly. Regular monitoring is essential to track changes and adjust treatment accordingly.
Keratoconus is generally categorized by stage, and each stage calls for a different approach to care. In the early stage, vision distortion is mild and may be manageable with glasses or soft contact lenses. In the mid-stage, the cornea has changed enough that standard lenses can no longer provide clear vision, and specialty lenses or intervention may be needed. Advanced keratoconus involves significant corneal shape change and sometimes scarring, which may point toward surgical options.
Your Cornea Specialist will use detailed corneal imaging at each visit to track where you are in this progression and what your cornea needs next.
Frequent eye rubbing is one of the most well-recognized factors that can worsen keratoconus progression. The mechanical stress placed on the already weakened cornea can accelerate thinning and shape change. Many patients rub their eyes due to allergies, so treating the underlying allergy with appropriate drops or medication can help reduce the urge to rub.
Avoiding eye rubbing is one of the simplest things you can do to protect your cornea. If you find it difficult to stop, mention this to your care team so we can address the cause.
Glasses and Contact Lenses for Keratoconus
For many patients, vision correction begins with glasses or standard contact lenses, and these options can remain effective for some time depending on the stage of the disease. As keratoconus progresses, specialty lenses often become necessary to achieve the visual clarity that standard eyewear can no longer provide. Our optometry team has deep expertise in fitting patients with the right lens for their unique corneal shape.
In the earliest stages of keratoconus, glasses can often provide satisfactory vision correction. When the cone shape is still mild, standard spherical or cylindrical lenses may correct much of the distortion. As the cornea becomes more irregular, however, the astigmatism pattern becomes too complex for glasses to address effectively, and patients often notice that their vision is blurry even with a new prescription.
Soft contact lenses are comfortable and easy to adapt to, making them a reasonable early option for some patients. In mild keratoconus, they can drape over the cornea and provide better vision than glasses alone. As the cone shape becomes more pronounced, however, soft lenses conform to the irregular surface and can no longer mask the distortion. At that point, a specialty lens is typically the next step.
Rigid gas-permeable (RGP) lenses are made of a firm material that holds its shape over the cornea. Because they do not flex to match the irregular surface, they create a smooth optical front that significantly improves vision in moderate keratoconus. RGP lenses can take a few weeks to feel comfortable, but most patients adapt well with the right fit and proper follow-up.
Scleral lenses are larger specialty lenses that rest on the white part of the eye, vaulting entirely over the cornea without touching it. This design fills the irregular space with a smooth layer of fluid, providing excellent optical clarity and comfort for patients with moderate to advanced keratoconus. Dr. Paul Zerbinopoulos, O.D., has been fitting scleral lenses for corneal conditions since 2008, and Dr. Earle Scharff, O.D., brings over 40 years of experience in specialty contact lens care. Hybrid lenses, which combine a rigid center with a soft outer edge, offer an alternative for patients who want the clarity of a rigid lens with the comfort of a soft one.
Corneal Cross-Linking to Stop Progression
Corneal cross-linking (CXL) is the only treatment proven to slow or halt the progression of keratoconus. It strengthens the structural bonds within the cornea so it becomes more resistant to further thinning and shape change. For patients with documented progression, cross-linking is often a critical intervention that protects the vision they have.
The procedure uses riboflavin (vitamin B2) eye drops combined with ultraviolet-A (UV-A) light to create new molecular bonds within the corneal tissue. These bonds reinforce the structural proteins in the cornea, making it stiffer and more stable. The FDA approved the epithelium-off cross-linking method using the Photrexa and KXL system, and this remains the standard of care for progressive keratoconus and corneal ectasia.
Dr. Elliot Perlman, M.D., Cornea Specialist and Director of the Corneal Service at Rhode Island Hospital and Brown University Medical School, was the first ophthalmologist in Rhode Island to offer FDA-approved corneal cross-linking. His experience spans over 45 years of corneal surgery, and he trained at Baylor College of Medicine after completing his residency at Yale University School of Medicine.
Cross-linking is most effective in patients with documented progression, meaning the cornea has measurably changed over time as shown by imaging. Younger patients and those with corneas that meet minimum thickness requirements are generally well-suited for the procedure. Patients who have stable disease and have not shown measurable worsening may not need cross-linking at that time, but ongoing monitoring helps your Cornea Specialist make that determination accurately.
The procedure takes approximately one hour and is performed with numbing drops so there is no pain during the treatment. Riboflavin drops are applied to the cornea, followed by a carefully measured period of UV-A light exposure. Most patients go home the same day wearing a protective bandage contact lens.
The first several days involve some eye discomfort, light sensitivity, and temporary blurry vision as the cornea begins to heal. These symptoms typically resolve within a week, though full visual stabilization takes longer.
The primary goal of cross-linking is corneal stability, not vision improvement. Most patients see the progression of their disease halt following the procedure, which is the most important outcome. Some patients experience a modest improvement in vision as swelling from the procedure subsides, though this varies from person to person. After cross-linking, regular follow-up visits are essential to confirm the cornea has stabilized, and most patients will continue to use specialty contact lenses or glasses to achieve their best corrected vision.
Intracorneal Ring Segments
Intracorneal ring segments, sometimes called by the brand name Intacs, are small curved implants placed within the cornea to reshape it from the inside. They can improve vision and make contact lens wear more comfortable in patients with mild to moderate keratoconus who still have a clear central cornea. One important advantage is that the procedure is reversible.
Ring segments are thin, curved pieces of medical-grade plastic that are inserted into a channel created within the corneal tissue. By gently redistributing the shape of the cornea, they partially flatten the cone and improve the regularity of the corneal surface. This can improve unaided vision or make it easier to fit and tolerate contact lenses, particularly in patients who have had difficulty with specialty lens comfort.
A surgeon creates a precise channel within the cornea, often using a femtosecond laser for accuracy. The ring segments are then guided into the channel, where they remain in place. The procedure typically takes less than thirty minutes, and the eye heals over a period of days to weeks. Because the segments can be removed if needed, this reversibility makes them an appealing option for appropriate candidates.
Ring segments are often considered for patients who are no longer seeing well enough with contact lenses but whose disease has not yet progressed to the point of requiring a transplant. They may also help patients who cannot tolerate contact lenses due to discomfort. In some cases, ring segments are combined with cross-linking to address both the shape irregularity and the ongoing progression. Your Cornea Specialist will evaluate whether rings are an appropriate fit for your corneal anatomy and disease stage.
Corneal Transplant Surgery
When keratoconus has progressed to an advanced stage, or when contact lenses can no longer provide functional vision, a corneal transplant may be the best path forward. Modern transplant techniques have advanced significantly and are tailored to the specific layers of the cornea that need to be replaced. Our Cornea Specialists have extensive experience with both partial and full-thickness transplant procedures.
Transplant surgery is typically considered when the cornea has severe shape distortion, significant scarring, or a complication called acute hydrops, which involves sudden fluid infiltration into the corneal tissue. Contact lens intolerance that cannot be resolved with specialty fittings is another indicator. Your Cornea Specialist will evaluate your imaging, visual function, and overall corneal health to determine whether and when transplant surgery is the right step.
Deep anterior lamellar keratoplasty (DALK) replaces the front layers of the cornea while leaving the patient's own back layer, called the endothelium, in place. Because the body is less likely to reject tissue that contains your own cells, DALK carries a lower risk of graft rejection than a full-thickness transplant. This makes DALK the preferred surgical option for most keratoconus patients who do not have endothelial damage.
Recovery from DALK is gradual, and glasses or specialty contact lenses are often still needed afterward to achieve the best possible vision. Dr. Jane Cook, M.D., Cornea Specialist, and Dr. Perlman both perform this procedure. Dr. Cook completed her cornea fellowship at Bascom Palmer Eye Institute, consistently ranked the top eye hospital in the United States.
Penetrating keratoplasty (PK) involves replacing the entire cornea with donor tissue. It is used when DALK is not technically feasible, such as in cases with severe central scarring or after an episode of acute hydrops that has compromised all corneal layers. PK carries a higher lifetime risk of graft rejection than DALK, making long-term follow-up and adherence to prescribed drops especially important. Most patients achieve strong vision after PK, often with the help of contact lenses or glasses for fine-tuning.
Both DALK and PK require a commitment to follow-up care over many months. Sutures are gradually removed over weeks to months, and the cornea continues to settle and change shape during this time. Full visual recovery can take a year or more, though most patients return to routine daily activities within a few weeks of surgery. Once healing is complete and sutures are removed, a specialty contact lens fitting is often done to achieve the sharpest possible vision with the new corneal shape.
Combined and Advanced Treatment Options
In some cases, more than one treatment is used together to address both corneal shape and ongoing disease progression. Understanding which combinations are appropriate, and which procedures should be avoided entirely, is an important part of planning care for keratoconus. Our Cornea Specialists carefully evaluate each patient before recommending any combined approach.
In selected patients, corneal cross-linking can be performed alongside other procedures, such as topography-guided surface laser treatment (PRK) or intracorneal ring segment placement. The goal of these combinations is to both halt progression and improve the shape of the cornea at the same time. Not every patient is a candidate for combined approaches, and a thorough pre-operative evaluation is needed to determine who is appropriate. Your Cornea Specialist will review your imaging and corneal measurements carefully before recommending this path.
LASIK and other laser vision correction procedures that remove corneal tissue are not appropriate for patients with keratoconus. Keratoconus already involves a weakened, thinning cornea, and removing additional tissue with a laser can further destabilize the structure and cause the condition to worsen rapidly. If you have been diagnosed with keratoconus, even in a mild form, it is essential to inform any eye surgeon or refractive surgery provider of your diagnosis before undergoing any laser procedure.
Research into keratoconus treatment continues to advance. Newer cross-linking protocols, refined surgical techniques, and investigational therapies are being studied in clinical trials at various centers. While standard treatments address the vast majority of patients effectively, those with complex or advanced cases may want to ask their Cornea Specialist whether any investigational options are relevant to their situation. We stay current with the latest evidence so we can offer you the most informed guidance available.
Frequently Asked Questions
These answers address common questions that come up when patients are planning their keratoconus care, particularly around timing decisions, recovery, and what to expect from each treatment.
The decision to pursue cross-linking is based on documented progression, not on how your vision feels day to day. Your Cornea Specialist uses corneal topography and tomography imaging taken over time to detect measurable changes in the shape or thickness of your cornea. If those images show the disease is advancing, cross-linking is typically recommended even if your vision seems acceptable with lenses. Waiting until vision worsens significantly can mean missing the optimal window for the procedure.
In most cases, yes. Cross-linking changes the structural stability of the cornea but does not eliminate the surface irregularity that makes specialty lenses necessary. Most patients continue wearing scleral or RGP lenses after cross-linking for their best corrected vision. It is generally advisable to wait until the cornea has fully healed before starting a new lens fitting, which may take several months. Your optometrist will guide the timing of your post-procedure lens evaluation.
Cross-linking is FDA-approved for patients 14 years of age and older. It is often recommended at younger ages when progression tends to be fastest, since halting the disease early preserves more of the natural corneal tissue and may reduce the likelihood of needing surgery later. Older patients with documented progression can also benefit. Age alone is not the deciding factor; what matters most is evidence that the disease is actively changing.
Many corneal transplants remain clear and functional for decades. DALK grafts often have a favorable long-term outlook because they retain the patient's own endothelium, the layer responsible for keeping the cornea clear. PK grafts carry a higher lifetime risk of rejection but can also last many years with proper care. The most common threat to a transplant is immune rejection, which can often be reversed if caught and treated early. This is why regular follow-up visits and prompt attention to any sudden change in vision or comfort are so important even years after surgery.
Most patients do require some form of vision correction after corneal transplant surgery because the transplanted cornea develops its own irregular curvature as it heals. Scleral lenses are often the best option for achieving sharp vision after transplant, and many patients are very satisfied with the combination of a clear, stable graft and a well-fitted scleral lens. In some cases, glasses or standard contact lenses provide adequate correction, and your optometrist will help determine the best approach once healing is complete.
Sudden worsening of vision, a rapid increase in eye pain, or the appearance of significant haziness or redness in an eye with keratoconus should be evaluated promptly. These symptoms could indicate acute corneal hydrops, a sudden fluid event that affects the corneal tissue and requires timely management. They could also signal early signs of graft rejection in a patient who has already had a transplant. Do not wait for a scheduled appointment if symptoms develop suddenly; contact our office or seek urgent eye care right away.
Visit Our Cornea Specialists at Rhode Island Eye Institute
Our team at Rhode Island Eye Institute brings together fellowship-trained Cornea Specialists, experienced optometrists, and advanced diagnostic technology to offer comprehensive keratoconus care under one roof. From specialty contact lens fittings and corneal cross-linking to complex transplant surgery, we are equipped to meet you wherever you are in your treatment journey. With faculty appointments at Brown University and a long history of serving patients across Rhode Island and southern Massachusetts, our team has the expertise and commitment to give you the highest level of corneal care. We would be glad to schedule a consultation and help you understand your options.