Keratoconus

Your cornea acts like a window that focuses light onto the back of your eye. In keratoconus, structural changes cause the cornea to weaken and lose its smooth, rounded shape. As the cornea becomes thinner and more irregular, light entering your eye scatters instead of focusing properly on your retina.

The bulging typically happens in the lower or central part of the cornea. This distortion creates multiple focal points that make it difficult to see clearly, even with corrective lenses.

Keratoconus usually appears during the teenage years or early twenties, though it can develop at any age. The condition affects people of all backgrounds, but certain groups face higher risk.

• Teenagers and young adults between ages 10 and 25
• People with certain connective tissue disorders
• Those with Down syndrome or other genetic conditions
• Individuals with chronic eye allergies or atopic disease
• People with a family history of keratoconus

Research shows that keratoconus can run in families, suggesting a genetic component to the condition. If you have a parent or sibling with keratoconus, your chances of developing it increase significantly.

Scientists have identified several genes that may contribute to keratoconus, though we still do not fully understand all the genetic factors involved. We recommend regular eye exams for family members of anyone diagnosed with this condition, especially during adolescence and early adulthood.

Vigorous or chronic eye rubbing is strongly linked to the development and progression of keratoconus. The mechanical stress from rubbing can damage corneal tissue and accelerate thinning. Many patients with allergies rub their eyes frequently, which may explain part of the connection between allergies and keratoconus.

While poor contact lens hygiene and improperly fitted lenses do not cause keratoconus, they can increase risk of eye irritation, inflammation, and infection. These complications may worsen discomfort and lead to more eye rubbing or cause corneal scarring that compounds vision problems.

• Control eye allergies and itching with appropriate medications
• Avoid vigorous or chronic eye rubbing at all times
• Treat dry eye and eyelid conditions that increase irritation
• Address floppy eyelid syndrome or sleep apnea if suspected, as both can increase nighttime rubbing
• Consider protective strategies such as keeping nails trimmed or using nighttime shields if unconscious rubbing is an issue

Several other corneal conditions can produce symptoms or test findings similar to keratoconus. Pellucid marginal degeneration causes thinning and bulging in the lower peripheral cornea rather than the central area. Keratoglobus involves generalized thinning across the entire cornea, creating a more rounded bulge.

Post-refractive surgery ectasia can develop years after LASIK or similar procedures, mimicking keratoconus progression. Contact lens warpage, where prolonged rigid lens wear temporarily reshapes the cornea, can create misleading topography patterns that resolve after a lens holiday. Accurate diagnosis matters because treatment approaches differ for each of these conditions.

In the earliest stages of keratoconus, regular eyeglasses or soft contact lenses may provide adequate vision correction. This approach works when corneal irregularity remains minimal and visual distortion is mild.

As the condition progresses, however, standard lenses become less effective because they cannot compensate for the irregular corneal shape. When you notice declining vision quality despite updated prescriptions, we explore more specialized options.

Rigid gas permeable lenses are often the next step when glasses no longer work well. These firm lenses rest on the cornea and create a tear layer between the lens and the irregular corneal surface. This tear lens fills in the irregularities and provides a smooth optical surface, dramatically improving vision for most keratoconus patients.

• Corneal RGP lenses correct irregular astigmatism through the tear lens effect
• Scleral lenses vault over the entire cornea and rest on the white part of your eye, offering exceptional comfort and stability
• Hybrid lenses combine a rigid center with a soft outer skirt for both clarity and comfort
• Custom fitting ensures proper alignment and maximizes visual improvement

Corneal cross-linking is a proven procedure that strengthens corneal tissue and can halt keratoconus progression in most patients. We apply riboflavin drops to your cornea and then expose it to controlled ultraviolet light, creating new bonds between collagen fibers that make the cornea more rigid and resistant to further bulging.

The primary goal of cross-linking is to stabilize your cornea and prevent further deterioration, not to improve vision directly. Many patients still need specialty contact lenses after the procedure for best vision. The most evidence-backed technique removes the corneal epithelium before treatment, though epithelium-on approaches are sometimes used with more variable results. We consider cross-linking only if your cornea meets minimum thickness requirements and you do not have active infection or severe uncontrolled surface disease.

This treatment is most effective when performed early, before severe thinning or scarring occurs. We may recommend cross-linking if you show signs of progression, particularly if you are young or your condition is advancing rapidly.

• Expect discomfort and light sensitivity for the first few days after epithelium-off treatment
• Temporary blurring or haze may occur during the first weeks to months as your cornea heals
• Infection risk exists, so follow all prescribed antibiotic and anti-inflammatory drop schedules carefully
• You will need to pause contact lens wear during the healing period
• Follow-up visits monitor healing and confirm stabilization over the following months

Intacs are tiny curved implants that we place within the corneal layers to reshape the bulging area and reduce irregular astigmatism. These plastic inserts can help flatten the cone and may make it easier to fit contact lenses or improve vision with glasses, though results vary among patients.

We may consider Intacs selectively when contact lenses no longer provide adequate vision or comfort but your cornea has not yet deteriorated to the point of needing transplant. Many patients still require specialty contact lenses after ring implant placement for optimal vision. The procedure is reversible, and we can remove or replace the implants if needed. Potential issues include glare, halos around lights, and rarely infection or implant extrusion.

• Best suited for patients with adequate corneal thickness and limited central scarring
• Results vary, with the goal being reduced irregularity and improved contact lens tolerance rather than eliminating the need for correction
• Ring implants do not stop keratoconus progression, so cross-linking may still be needed
• Realistic expectations are important, as visual improvement is not guaranteed for everyone

Corneal transplant surgery becomes an option when keratoconus causes severe scarring or thinning that cannot be managed with other treatments. During transplant, we replace the damaged central cornea with healthy donor tissue. Modern techniques, including deep anterior lamellar keratoplasty, allow us to replace only the affected corneal layers while preserving your own healthy inner layer. This approach reduces rejection risk and improves long-term outcomes compared to full-thickness transplants. When deep scarring, hydrops scars, or inner layer involvement is present, full-thickness penetrating keratoplasty may be necessary.

Recovery from transplant takes many months. Your vision stabilizes gradually as the cornea heals and sutures are managed over time. You will need steroid eye drops for an extended period to prevent rejection, and most patients achieve significantly improved vision but will likely still need glasses or contact lenses for best results.

• Increasing redness or pain in the transplanted eye
• Sudden drop in vision or new light sensitivity
• Persistent irritation or discharge
• Any of these symptoms may signal rejection or infection and require prompt evaluation

Once your keratoconus has stabilized, either naturally or after cross-linking, additional vision correction options may be considered in select cases. Specialty soft contact lenses designed specifically for keratoconus offer improved comfort for some patients compared to rigid lenses. Piggyback systems, where a soft lens is worn under a rigid lens, can enhance comfort while maintaining clear vision.

For patients with significant residual refractive error after stabilization, phakic intraocular lenses may occasionally be discussed, though careful evaluation is essential. Refractive laser procedures such as topography-guided surface ablation combined with cross-linking are not routine and are only considered in carefully selected stabilized cases based on individual clinician judgment and current protocols.