Factors That Increase Your Risk of Developing Keratoconus
Understanding Keratoconus and Why Risk Factors Matter
Recognizing who is most likely to develop keratoconus allows us to catch subtle corneal changes before symptoms become serious. The more we understand about your personal history, the better we can tailor your care and monitoring plan.
The cornea relies on strong collagen fibers to hold its dome shape and focus light onto the retina at the back of the eye. In keratoconus, those fibers weaken over time, causing the cornea to thin and shift forward. This distortion affects clarity, contrast, and how well you can function with glasses or standard contact lenses.
Risk factors do not cause keratoconus on their own. They simply make the condition more likely to develop compared to someone without those factors. Some risk factors, such as genetics, cannot be changed. Others, including chronic eye rubbing, are within your control and worth addressing right away.
If you have known risk factors, pay attention to any vision changes between your scheduled exams. These signs warrant an earlier appointment rather than waiting for your next routine visit.
- Blurred or distorted vision that gradually worsens, especially at night
- Increased sensitivity to light or glare around streetlights
- Frequent prescription changes in glasses or contact lenses
- Seeing double images or streaking around light sources
- Contact lenses that suddenly feel uncomfortable or fit differently
Genetic and Family-Related Risk Factors
Your genetic background plays one of the strongest roles in keratoconus risk. Understanding your family history helps us determine how closely and how often to monitor your corneas.
Having a parent, sibling, or child with keratoconus meaningfully increases your own risk. The hereditary pattern is not perfectly predictable, meaning keratoconus can appear in a generation even when other family members have never been diagnosed. If a close relative has the condition, baseline corneal screening is a sensible step for you as well.
Several inherited conditions are associated with significantly elevated keratoconus rates because they affect connective tissue throughout the body, including the cornea. People with any of the following diagnoses should receive regular corneal screening throughout their lives.
- Down syndrome, which affects corneal structure and strength
- Ehlers-Danlos syndrome, causing tissue laxity in the skin, joints, and eyes
- Marfan syndrome, affecting connective tissue in the heart, skeleton, and eyes
- Osteogenesis imperfecta, also called brittle bone disease
Keratoconus most often begins during the teenage years and progresses through the twenties and early thirties. The condition tends to stabilize by around age 40, though this varies from person to person. Young people with additional risk factors benefit most from early baseline corneal imaging, since catching changes in adolescence preserves the widest range of treatment options.
Behavioral and Environmental Risk Factors
Several everyday habits and environmental exposures can influence whether keratoconus develops or worsens. The good news is that many of these factors are within your power to change.
Vigorous, repeated eye rubbing is one of the most important modifiable risk factors for keratoconus. The pressure and friction applied during rubbing can weaken corneal tissue over time and accelerate progression in people who are already susceptible. Many people rub their eyes without realizing how frequently they do it, particularly when tired, anxious, or dealing with allergies.
Breaking this habit is one of the most impactful protective steps you can take for your long-term corneal health.
People living with chronic eye allergies, eczema, asthma, or hay fever have higher rates of keratoconus. The link appears strongest in those with severe allergic eye disease that causes persistent itching and irritation. Inflammation from allergies may weaken corneal fibers, and the resulting eye rubbing compounds the damage. Managing your allergies effectively protects both your comfort and your corneas.
Contact lenses do not cause keratoconus in healthy eyes. However, lenses that fit poorly and rub against the same area of the cornea repeatedly may contribute to problems in people who are already at risk. This concern applies particularly to rigid lens designs that create pressure points. We check contact lens fit carefully and recommend more frequent fitting assessments for patients with known keratoconus risk factors.
Some research suggests that prolonged ultraviolet light exposure and oxidative stress from environmental pollutants may play a role in corneal weakening over time, though the evidence is less definitive than for other risk factors. Wearing wraparound sunglasses with UV protection is a simple, low-effort habit that supports overall corneal health and is especially sensible for those with other risk factors.
Medical Conditions That Increase Keratoconus Risk
A number of systemic health conditions are associated with higher keratoconus rates, often because they affect the connective tissue or structural integrity of the cornea. Letting us know about any relevant diagnoses helps us tailor your screening plan appropriately.
The cornea depends on healthy collagen fibers to maintain its shape. Any disorder that weakens collagen throughout the body also increases the likelihood of corneal instability. If you have been diagnosed with a connective tissue condition, we recommend regular corneal mapping even when your vision appears normal, since early changes are often invisible without specialized imaging.
Individuals with Down syndrome develop keratoconus at rates many times higher than the general population. The chromosomal differences associated with Down syndrome affect corneal structure and strength in ways that make thinning and shape changes more likely. We recommend baseline corneal mapping in childhood for patients with Down syndrome, followed by regular follow-up through adolescence and adulthood. Caregivers should also be alert to frequent eye rubbing, which is common in this group.
Obstructive sleep apnea, a condition in which breathing repeatedly stops during sleep, is associated with floppy eyelid syndrome. In floppy eyelid syndrome, the eyelids are unusually loose and can rub against a pillow during sleep, placing chronic mechanical stress on the cornea. If you have been diagnosed with sleep apnea or notice that your eyelids turn outward unusually easily, please mention it during your eye exam so we can assess your corneal health and discuss protective options.
Hormonal fluctuations during puberty and pregnancy may influence keratoconus progression in people who already have the condition or are at elevated risk. Some patients notice vision changes during pregnancy that partially resolve after delivery. We typically monitor pregnant patients with keratoconus more closely and generally delay elective corneal procedures until after delivery and breastfeeding are complete. Adolescents going through puberty with other risk factors should also have regular corneal assessments during this period.
Screening and Monitoring for High-Risk Patients
For patients with known risk factors, regular monitoring is the cornerstone of protecting your vision. We use advanced imaging technology to detect even subtle corneal changes long before symptoms become noticeable.
If you have any of the risk factors described on this page, schedule a comprehensive eye examination that includes corneal imaging rather than waiting for your routine checkup. Teenagers and young adults with family history, genetic syndromes, or chronic allergies are especially good candidates for early baseline mapping. We build a personalized monitoring schedule based on your individual risk level and update it as your health picture evolves.
Corneal topography is a painless, non-contact imaging technique that creates a detailed map of your cornea's surface shape. It can detect irregular patterns associated with early keratoconus before any vision symptoms are apparent. For higher-risk patients, we may also use corneal tomography, which measures the cornea in three dimensions and captures data from both the front and back surfaces. Having baseline images on file allows us to track changes over time with great precision.
A keratoconus risk assessment at our practice begins with a thorough review of your personal and family medical history. We also discuss your habits, including eye rubbing frequency, allergy symptoms, and contact lens wear. The examination typically includes the following components.
- Visual acuity testing with your current correction
- Slit-lamp examination of the cornea using a specialized microscope
- Corneal topography or tomography imaging
- Tear film evaluation and screening for dry eye or allergic eye disease
Not every at-risk patient needs the same monitoring frequency. Patients with a single mild risk factor may do well with annual corneal imaging alongside their routine eye exam. Those with multiple risk factors, a positive family history, or an associated genetic syndrome may benefit from corneal assessments every six months. We adjust your schedule based on what each examination reveals and any changes in your overall health or symptoms.
Managing Risk Factors to Protect Your Corneas
While we cannot change your genetics, we can work together to address the risk factors that are within your control. A combination of good habits, effective treatment for related conditions, and close monitoring gives you the best chance of preserving your vision long term.
Consistent allergy management reduces both corneal inflammation and the urge to rub your eyes. Depending on the severity of your allergic eye disease, we may recommend antihistamine eye drops, mast cell stabilizers, or anti-inflammatory medications to keep symptoms under control year-round, not just during peak allergy season. Reducing inflammation is a direct way to lower mechanical stress on the cornea.
Because eye rubbing is often unconscious, breaking the habit requires identifying your specific triggers and replacing the behavior with a safer alternative. The following strategies have helped many of our patients reduce rubbing significantly.
- Apply a cool, damp cloth to closed eyes when itching or irritation strikes
- Use preservative-free artificial tears to relieve dryness and mild discomfort
- Keep your hands occupied with a stress device when you feel the urge to rub
- Switch to glasses during high-pollen days or when your eyes are especially irritated
- Address the root cause by treating allergies, dry eye, or fatigue effectively
A few straightforward daily habits support corneal strength in people with known risk factors. Wearing wraparound sunglasses reduces UV exposure and limits contact with airborne allergens. Removing eye makeup gently without tugging at the eyelid protects delicate tissue. Staying well-hydrated, getting adequate sleep, and maintaining overall health support all body tissues, including the collagen fibers that keep your corneas strong.
If corneal imaging reveals early changes in a high-risk patient, we may discuss corneal cross-linking, a procedure that uses ultraviolet light and riboflavin drops to strengthen corneal tissue and slow or halt progression. Cross-linking is most effective when performed at an early stage before significant thinning has occurred. Not everyone with risk factors will need this treatment, and we evaluate each patient individually based on imaging results, progression rate, age, and overall health before making any recommendation.
If you experience sudden or rapidly worsening vision changes, do not wait for your next scheduled appointment. These symptoms deserve prompt evaluation, especially if you have known risk factors for keratoconus.
- Sudden increase in blurred or distorted vision
- Notable worsening of glare or light sensitivity
- Contact lenses that abruptly stop fitting comfortably or correcting your vision
- Eye pain or unusual discomfort
Frequently Asked Questions
The following questions address common concerns that come up when patients learn they have risk factors for keratoconus. If your situation is not covered here, we are happy to answer your questions directly during your visit.
You cannot change your genetic makeup, but you can meaningfully reduce your overall risk by controlling the modifiable factors on top of it. Stopping eye rubbing, treating allergies consistently, and protecting your eyes from trauma all work together to lower the cumulative stress on your corneas. Pairing these habits with regular corneal monitoring means that if changes do begin, we can detect them at the earliest and most treatable stage.
We recommend establishing a baseline corneal map during childhood rather than waiting until vision symptoms appear. Because keratoconus rates are substantially higher in individuals with Down syndrome, early documentation of the corneal shape gives us a reference point so that any future changes are immediately recognizable. Caregivers should also let us know if the child rubs their eyes frequently, since addressing that habit early may help protect the cornea over time.
A diagnosis of mild or early keratoconus does not guarantee progression, and many patients remain stable for years with appropriate monitoring and habit changes. The likelihood of progression is higher in younger patients and in those who continue rubbing their eyes or have uncontrolled allergies. Our cornea team, including Dr. Jane Cook, Dr. Christopher Newton, and Dr. Elliot Perlman, uses serial imaging to track your specific situation and will discuss treatment options, including cross-linking, if progression is detected.
Having risk factors alone is not a reason to stop wearing contacts, but it is a reason to make sure your lenses are fitting properly and not creating chronic pressure on the cornea. We may recommend more frequent fitting checks and may suggest lens designs that distribute pressure more evenly. If early corneal changes are detected, we will guide you on the safest lens options for your specific situation, which sometimes includes specialty lenses designed specifically for irregular corneas.
Because keratoconus can begin at any point during adolescence or early adulthood and occasionally in midlife, ongoing monitoring is wise for as long as risk factors are present. Monitoring frequency may decrease as you move past the highest-risk decades, typically the twenties and thirties, but it does not stop entirely. We review your monitoring schedule at each visit and adjust it based on your age, corneal stability, and overall health picture.
See Our Cornea Team at Rhode Island Eye Institute
If you have any risk factors for keratoconus, we encourage you to schedule a comprehensive corneal evaluation with our team of specialists. At Rhode Island Eye Institute, Dr. Jane Cook, Dr. Christopher Newton, and Dr. Elliot Perlman bring advanced training and state-of-the-art corneal imaging to every patient evaluation, helping you stay ahead of changes before they affect your vision. Contact us today to book your appointment and take a proactive step toward protecting your long-term eye health.