Keratoconus
Understanding Keratoconus
In a healthy eye, your cornea is dome-shaped and has a smooth, even curve. When you have keratoconus, the structure of the cornea becomes weaker over time. The weakened tissue cannot maintain its normal round shape and starts to thin in specific areas.
As the cornea thins, the weakened tissue becomes more vulnerable to deformation. Normal pressure inside your eye can contribute to pushing the weakened area forward, but the cone shape is mainly the result of biomechanical failure in the corneal structure. This creates an irregular cone or bulge that distorts the way light enters your eye. The shape change can happen slowly over many years or progress more quickly in some cases.
The irregular cone shape of your cornea scatters light rays instead of focusing them clearly. This causes blurry vision that glasses may not fully correct, especially as the condition advances. You may also experience double vision in one eye or see multiple ghost images around objects.
- Difficulty reading street signs or seeing details at a distance
- Blurred or wavy vision that changes frequently
- Increased sensitivity to bright lights and glare
- Seeing halos or starbursts around lights at night
Keratoconus typically progresses through several stages, from mild to severe. In the early stage, you might notice only slight blurring that can be corrected with glasses or soft contact lenses. As the condition moves to moderate stages, the cornea becomes more cone-shaped and vision problems become harder to correct.
In advanced keratoconus, the cornea may develop scarring or become very steep and irregular. At this point, you will likely need specialized contact lenses or other treatments to see clearly. Our eye doctor will monitor the stage of your condition to recommend the most appropriate care.
Currently, we do not have a way to prevent keratoconus from developing if you are genetically prone to it. However, you can take steps to reduce your risk of making it worse. Avoiding eye rubbing is one of the most important preventive measures, since excessive rubbing can weaken the cornea further.
If you have allergies or conditions that make your eyes itchy, we can help you manage those symptoms so you are less tempted to rub. Early detection through regular eye exams also allows us to start treatment sooner, which may slow or stop the progression of the disease.
Recognizing the Signs and Symptoms of Keratoconus
The earliest signs of keratoconus are often subtle and easy to miss. You might find that your eyeglass prescription changes more often than it used to, sometimes every few months. Mild blurring that comes and goes or vision that seems slightly distorted may also appear in the beginning.
- Frequent changes in your glasses or contact lens prescription
- Slight blurring that does not fully clear with your current glasses
- Mild distortion when looking at straight lines or text
- Noticing that one eye seems to focus differently than the other
As keratoconus advances, your vision problems will become more noticeable and harder to ignore. You may see streaks or trails coming from lights, especially when driving at night. Straight edges like doorways or window frames might look bent or wavy.
Some people with progressing keratoconus also report that their vision fluctuates throughout the day. What you could see clearly in the morning might look blurry or distorted by afternoon. This can happen due to changes in tear film, contact lens fit, or corneal swelling. These ongoing changes may be a sign that your cornea is continuing to change shape.
Keratoconus does not usually cause pain, but you may experience other forms of eye discomfort. Your eyes might feel tired or strained after reading or using a computer, even for short periods. Some people notice increased sensitivity to light, wind, or dust.
- Eye strain or fatigue during visual tasks
- Feeling like something is in your eye when nothing is there
- Increased light sensitivity or trouble with glare
- Redness or irritation, especially if you rub your eyes
Most keratoconus symptoms develop gradually, but certain signs require immediate attention. A rare complication called acute corneal hydrops can occur when a break in the Descemet membrane allows fluid to enter the cornea, causing rapid swelling. Symptoms of hydrops include sudden foggy vision, pain or foreign body sensation, tearing, and sensitivity to light.
Contact lens wearers and patients who have had corneal procedures also need to watch for specific warning signs that require urgent evaluation. If you experience any of these symptoms, contact our office or seek emergency eye care right away.
- Severe eye pain, especially with light sensitivity and discharge
- Rapidly worsening redness or sudden vision drop while wearing contact lenses
- Increasing pain, redness, or decreased vision after cross-linking, Intacs, or transplant surgery
- Sudden severe vision loss or sharp eye pain
You should also seek prompt care if you notice a sudden increase in blurring or distortion that happens over days rather than months. Quick evaluation allows us to determine whether your condition is worsening rapidly and whether you need more aggressive treatment.
What Causes Keratoconus and Who Is at Risk?
Keratoconus often runs in families, which tells us that genetics play an important role. If you have a parent or sibling with the condition, your risk of developing it is higher than someone with no family history. However, many people with keratoconus have no known relatives with the disease.
Researchers have identified several genes that may be linked to keratoconus, but the exact inheritance pattern is still being studied. We recommend that family members of people with keratoconus have regular comprehensive eye exams so we can detect any early signs.
Frequent and vigorous eye rubbing is one of the strongest risk factors we know for keratoconus. The repeated pressure and friction can damage the delicate collagen fibers in your cornea, making it more likely to weaken and bulge. People who rub their eyes because of allergies, irritation, or habit are at higher risk. Avoiding eye rubbing is the most actionable step you can take to reduce your risk.
- Chronic eye rubbing due to allergies or dry eyes
- Habitual rubbing when tired or stressed
- Irritation that increases eye rubbing, including from poorly fitting lenses
- Possible oxidative or environmental factors, though evidence is less direct than for eye rubbing
Certain health conditions appear more frequently in people with keratoconus. If you have Down syndrome, Ehlers-Danlos syndrome, or other connective tissue disorders, your risk is considerably higher. These conditions affect the structure of collagen throughout your body, including in your cornea.
Chronic allergic conditions like eczema, asthma, and hay fever are also linked to keratoconus. The connection likely relates to increased eye rubbing and inflammation. Floppy eyelid syndrome and obstructive sleep apnea are additional associations, primarily because of mechanical factors and eye rubbing during sleep.
These associations help us identify higher-risk patients but do not prove that one condition causes the other. If you have any of these conditions, we will monitor your corneal health more closely during your eye exams.
Keratoconus most often begins during the teenage years or early twenties. The condition usually progresses most rapidly during this time and then may slow down or stabilize as you reach your thirties or forties. However, the age of onset and the rate of progression can vary widely from person to person.
Earlier onset, especially in childhood, often means a more aggressive form of the disease. We pay close attention to younger patients and may recommend treatments to halt progression sooner. Late onset keratoconus, which starts after age 40, is less common and tends to progress more slowly.
How We Diagnose Keratoconus
If we suspect keratoconus based on your symptoms or vision changes, we will perform a detailed examination of your eyes. We start by checking your vision with different lenses to see how well we can correct your eyesight. We also examine the front surface of your eye using a specialized microscope called a slit lamp.
During the slit lamp exam, we look for telltale signs like thinning of the cornea, a cone-shaped bulge, or tiny stress lines in the deeper layers. We may also shine a special light called a retinoscope into your eye to see how light reflects off your cornea. Unusual reflection patterns can indicate irregular corneal shape.
Corneal topography is the most important test we use to diagnose and monitor keratoconus. This painless test creates a detailed color-coded map of your cornea, showing its exact shape and curvature. You simply rest your chin on a support and look at a target while the device captures images in seconds.
- Reveals the steep cone-shaped areas typical of keratoconus
- Detects very early changes before symptoms appear
- Helps us track progression over time with repeat testing
- Guides contact lens fitting and treatment planning
Pachymetry measures the thickness of your cornea at different points. In keratoconus, the cornea is thinner than normal, especially in the areas where the bulge is forming. This test uses ultrasound or light waves and takes only a few seconds to complete.
Knowing your corneal thickness helps us confirm the diagnosis and determine how advanced your keratoconus is. It also helps us decide whether certain treatments, like corneal cross-linking, are appropriate for you. We will often repeat this test during follow-up visits to watch for any further thinning.
Advanced imaging technologies give us an even more detailed view of your cornea. Optical coherence tomography, or OCT, uses light waves to create cross-sectional images of the corneal layers. This allows us to see subtle structural changes and measure thickness very precisely.
We may also use corneal tomography, which evaluates both the anterior and posterior corneal surfaces along with elevation mapping. This three-dimensional analysis can detect the earliest signs of keratoconus before traditional topography would find them. Documenting progression through serial maps, changes in refraction and astigmatism, and corneal thinning helps us decide when treatments like corneal cross-linking are needed. These advanced tools are especially helpful when we need to distinguish keratoconus from other corneal conditions such as pellucid marginal degeneration or post-refractive surgery ectasia.
Treatment Options for Keratoconus
In the earliest stages of keratoconus, regular eyeglasses or standard soft contact lenses may provide clear enough vision for daily activities. As long as the corneal irregularity is mild, these simple options can correct your blurry vision effectively. We will start with the least invasive approach when possible. However, glasses and standard soft lenses improve vision but do not stop keratoconus from progressing.
As keratoconus progresses and the cornea becomes more irregular, glasses and soft lenses usually become less effective. When you notice that new glasses no longer give you sharp vision, it is likely time to move to more specialized contact lenses. We will reassess your needs at each visit to ensure your vision correction is still working well.
Rigid gas permeable lenses, or RGP lenses, are often the next step in managing keratoconus. These firm lenses hold their shape on your eye and create a smooth optical surface that corrects the irregular cornea beneath. They provide much sharper vision than soft lenses once your keratoconus reaches moderate stages. Corneal RGP lenses may feel uncomfortable at first and require an adaptation period.
- Scleral lenses are larger and vault over the entire cornea
- They rest on the white part of your eye for greater comfort
- A fluid reservoir between the lens and cornea protects the delicate tissue
- Many patients find scleral lenses easier to wear for long hours
- Custom fitting by our eye doctor ensures the best vision and comfort
Other specialized lens options may also be used depending on your corneal shape and comfort needs. Hybrid lenses combine a rigid center with a soft outer skirt for easier handling. Custom soft keratoconus lenses are designed to fit irregular corneas. Piggyback systems use a soft lens underneath a rigid lens for added comfort. We will work with you to find the best fit for your eyes and lifestyle.
Corneal cross-linking is a procedure that strengthens the collagen fibers in your cornea to halt keratoconus from getting worse. During the treatment, we apply riboflavin eye drops to your cornea and then expose it to controlled ultraviolet light. This creates new bonds between collagen fibers, making the cornea more rigid and stable.
Cross-linking is a widely used standard treatment to reduce progression risk. It does not reverse damage that has already occurred, but it can prevent further bulging and vision loss. The procedure is most effective when performed in the earlier stages of keratoconus and is typically recommended for patients with documented progression, especially younger patients. Minimum corneal thickness is considered before treatment, and modified protocols may be used when the cornea is thin.
The procedure is performed in an outpatient setting and recovery usually takes a few days to weeks. You should be aware of the risks and aftercare requirements before deciding on this treatment.
- Temporary pain and sensitivity to light after the procedure
- Epithelial defect when the outer layer is removed during treatment
- Small risk of infection, corneal haze, or delayed healing
- You may need a bandage contact lens for several days
- Activity restrictions include avoiding water exposure to the eye
- You will need to use prescription eye drops and attend frequent follow-up visits
Intacs are tiny curved plastic inserts that our eye doctor can place in your cornea to help flatten the cone shape. These segments are positioned in the outer part of the cornea through a small opening. By reshaping the cornea, Intacs may improve your vision and make contact lens fitting easier.
This procedure may be considered in specific cases when contact lenses alone do not provide adequate vision but you want to avoid or delay a corneal transplant. Intacs are removable and adjustable, but outcomes can vary. The use of Intacs is selective and varies by practice. Candidacy depends on your corneal thickness, the location of the cone, and whether you have corneal scarring.
Complications can include infection, glare or halos around lights, ring extrusion, and unpredictable refractive results. You should have realistic expectations about what Intacs can achieve. We will discuss whether this option is appropriate based on the severity and location of your keratoconus.
When keratoconus is very advanced and other treatments no longer work, a corneal transplant may be necessary. During this surgery, we remove the damaged central part of your cornea and replace it with healthy donor tissue. There are different types of transplants. Deep anterior lamellar keratoplasty, or DALK, is a partial thickness transplant that keeps your own healthy inner endothelial layer and may reduce the risk of rejection. Penetrating keratoplasty, or PK, is a full thickness transplant that replaces all corneal layers.
Transplant surgery has a high success rate for restoring vision in severe keratoconus, but it carries risks and requires a long recovery. Most people still need glasses or specialty contact lenses after a transplant. Rejection is a serious risk that requires vigilant monitoring. You should seek urgent care if you notice rejection warning signs, which include redness, sensitivity to light, vision decrease, or pain.
- Risk of rejection, infection, and irregular astigmatism
- Suture-related complications and prolonged visual rehabilitation
- Steroid eye drops may be needed long term and can raise eye pressure or cause cataracts
- Recovery takes several months to a year or more
- Frequent follow-up visits are essential to monitor graft health
Choosing the best treatment depends on several factors, including how advanced your keratoconus is, how quickly it is progressing, and your age. We also consider your lifestyle, your ability to wear contact lenses comfortably, and your personal preferences. There is no single right answer for everyone.
Our goal is to give you the clearest, most comfortable vision possible while protecting your cornea from further damage. We may recommend a combination of treatments, such as cross-linking to stop progression along with specialty contact lenses to improve your vision. We will explain each option and work with you to create a personalized treatment plan.
Living with Keratoconus: Self-Care and Follow-Up
One of the most important things you can do is to stop rubbing your eyes completely. Even occasional rubbing can weaken your cornea and make keratoconus worse. If your eyes itch due to allergies, we can prescribe antihistamine drops or other medications to relieve the irritation without rubbing.
- Avoid rubbing your eyes and use strategies to reduce itch
- Manage allergies with appropriate medications
- Use artificial tears if your eyes feel dry or irritated
- Wear sunglasses outdoors to protect against UV rays and reduce glare
If you wear specialty contact lenses for keratoconus, proper care is essential for your eye health and lens performance. Always wash your hands thoroughly before touching your lenses. Clean and disinfect your lenses exactly as our eye doctor instructs, using only the recommended solutions.
Never sleep in your lenses unless we specifically tell you they are approved for overnight wear. Replace your lenses and lens cases on the schedule we provide. If you notice any redness, pain, or sudden vision changes while wearing your lenses, remove them immediately and contact our office.
Regular follow-up visits are critical for managing keratoconus successfully. In the early stages or if your condition is progressing, we may want to see you every three to six months. These appointments allow us to track any changes in your corneal shape and adjust your treatment as needed.
During follow-up exams, we will repeat corneal topography and other tests to compare with your previous results. If we see signs of progression, we can intervene quickly with treatments like cross-linking. Once your keratoconus stabilizes, we may extend the time between visits, but you should never skip your scheduled appointments.
Living with keratoconus means adjusting to vision that may not be perfect even with the best correction. Good lighting is your friend, especially for reading and detailed work. You might need to sit closer to screens or use larger text sizes on your devices.
Driving at night can be challenging because of glare and halos around lights. Give yourself extra time and avoid rushing, or consider limiting night driving if it feels unsafe. Many people with keratoconus find that staying organized and planning ahead helps them feel more confident managing daily tasks despite their vision challenges.
Frequently Asked Questions
Keratoconus very rarely causes complete blindness. While the condition can severely reduce your vision quality, treatments like specialty contact lenses and corneal transplants often restore functional eyesight. However, outcomes vary, and some patients may experience complications such as severe scarring, contact lens intolerance, or transplant-related issues that can limit vision. Regular monitoring and prompt treatment improve your chances of maintaining useful vision for daily activities.
Keratoconus typically affects both eyes, but it often progresses at different rates in each eye. One eye may develop symptoms months or even years before the other, and one may always be more severely affected. We will monitor both eyes closely even if only one is currently causing vision problems.
There is a genetic component to keratoconus, so your children have a higher risk than the general population. However, inheritance is not guaranteed, and many children of affected parents never develop the condition. We recommend that your children have regular comprehensive eye exams starting in their early teens so we can catch any signs early.
Coverage for keratoconus treatment varies widely depending on your insurance plan. Many plans cover medically necessary treatments like corneal cross-linking and transplant surgery, but specialty contact lenses may have limited coverage or require out-of-pocket payment. Our office staff can help you verify your benefits and explore payment options before starting treatment.
In general, LASIK and other laser vision correction procedures are not appropriate if you have keratoconus. These surgeries remove corneal tissue, which would further weaken an already unstable cornea and could make your condition much worse. We screen carefully for keratoconus and ectasia risk factors before approving anyone for LASIK to prevent this complication.
Keratoconus often stabilizes naturally as you get older, usually by your late thirties or forties. However, we cannot predict whether or when this will happen in your case, and stabilization is less reliable in younger patients. Waiting for natural stabilization is not advisable if your vision is worsening, because treatments like corneal cross-linking work best when performed before too much corneal damage occurs. When we document progression through imaging and vision changes, we typically recommend intervention.
Getting Help for Keratoconus
If you are experiencing vision changes or have been diagnosed with keratoconus, our eye doctor is here to help you preserve your sight and quality of life. We offer comprehensive testing, the latest treatment options, and ongoing support to manage this condition effectively. Schedule an appointment with us so we can evaluate your eyes and create a personalized care plan tailored to your needs.