iLink® Corneal
Cross-Linking
The first and only FDA-approved corneal cross-linking treatment to slow or stop the progression of keratoconus. At Greenwich Ophthalmology Associates, our fellowship-trained cornea specialists use iLink® to strengthen the cornea, preserve your vision, and help you avoid a corneal transplant.
The Only Treatment That Stops Progression
Keratoconus is a progressive eye condition in which the cornea slowly thins and bulges into a cone shape, causing blurry and distorted vision that worsens over time. While glasses, contact lenses, and specialty lenses can improve how you see, none of them stop the disease from getting worse. Only corneal cross-linking addresses the root cause by strengthening the cornea itself.
iLink® uses riboflavin (vitamin B2) eye drops and controlled ultraviolet-A light to create new bonds between collagen fibers in the cornea. These new cross-links stiffen and reinforce the corneal tissue, halting the thinning and bulging that causes vision loss. Studies show that cross-linking can increase the rigidity of the treated corneal layers by roughly 300 percent, and that the stabilization lasts 5 to 10 years or more after a single treatment.
Who Is a Good Candidate?
iLink® is FDA-approved for patients aged 14 and older with progressive keratoconus or corneal ectasia following refractive surgery. Your doctor will evaluate you based on the following criteria.
- Documented progression of keratoconus, typically 1 diopter or greater increase in maximum curvature (Kmax) over 6 to 12 months
- Minimum corneal thickness of approximately 400 microns at the thinnest point (swelling solutions available for thinner corneas)
- No severe corneal scarring, active infection, or significant opacities
- Not currently pregnant or nursing, and no history of herpes simplex keratitis
What Is Keratoconus?
The cornea normally has a smooth, dome shape. In keratoconus, it thins and bulges into a cone, scattering light unevenly and causing blurry, distorted vision.
Scleral Lenses for KeratoconusUnderstanding Keratoconus
Know the Warning Signs
Frequent prescription changes, worsening astigmatism, ghosting, halos around lights, and light sensitivity can all be early signs of keratoconus.
Schedule a ScreeningYour iLink® Doctors
Our experienced ophthalmologists work together to evaluate, treat, and monitor your keratoconus
How iLink® Cross-Linking Works
A proven approach to corneal strengthening that creates new bonds between collagen fibers
Riboflavin Saturation
After the thin outer layer of the cornea (epithelium) is gently removed, FDA-approved Photrexa® Viscous riboflavin drops are applied over approximately 30 minutes. The vitamin B2 solution soaks deep into the corneal stroma, preparing the tissue to respond to UV light while also protecting deeper eye structures.
UV-A Light Activation
The KXL® System delivers precisely calibrated ultraviolet-A light to the cornea for approximately 30 minutes. The UV-A energy activates the riboflavin, generating a chemical reaction that forms new molecular bonds (cross-links) between collagen fibers throughout the corneal stroma.
Lasting Corneal Strength
The newly formed cross-links stiffen and reinforce the corneal tissue, increasing rigidity by roughly 300 percent in the treated layers. This structural strengthening halts the progressive thinning and bulging that causes keratoconus to worsen. Studies show durable stabilization lasting 5 to 10 years or more.
What the Clinical Evidence Shows
iLink® has been rigorously studied in FDA clinical trials and peer-reviewed research worldwide
Proven Stabilization Rates
Approximately 95 percent of treated patients see their keratoconus progression stop or slow significantly after the procedure. In one study, 96.6 percent of treated eyes showed halted progression at 24 months. A UK study of the iLink® V protocol found 98.3 percent of patients achieved stability at 24 months of follow-up.
Corneal Flattening Over Time
In FDA Phase 3 trials, treated eyes showed steady flattening of maximum corneal steepness (Kmax) from month 3 through month 12, while untreated control eyes continued to get steeper. This demonstrates that iLink® does more than just halt progression for many patients. It can also modestly improve corneal shape over time.
Fewer Corneal Transplants
Without treatment, roughly 1 in 5 patients with progressive keratoconus will eventually need a corneal transplant. In Norway, keratoconus-related transplants dropped by 80 percent within 15 years of cross-linking becoming available. In the United States, transplant procedures dropped from 3,166 in 2017 to 2,334 in 2022.
Clinical data from FDA filings, peer-reviewed publications, and international outcome studies. Individual results may vary. Discuss expected outcomes with your cornea specialist during your consultation.
What to Expect with iLink®
From the day of your procedure through full recovery, here is a clear picture of the process
During the Procedure (About 1 Hour)
iLink® is a same-day outpatient procedure. Numbing eye drops keep you comfortable throughout. Your doctor gently removes the thin outer corneal layer (epithelium), applies Photrexa® riboflavin drops over about 30 minutes, and then activates them with UV-A light from the KXL® System for another 30 minutes. A bandage contact lens is placed on the eye afterward to protect it while healing.
Days 1 to 7: Initial Healing
Some discomfort is expected, often described as a gritty or burning feeling. Pain is usually manageable with over-the-counter acetaminophen and preservative-free artificial tears. Light sensitivity is common during the first several days, and sunglasses are recommended. Do not rub your eyes. Most patients take 2 to 3 days off from work. The bandage lens is removed once the epithelium has healed, typically within 4 to 7 days.
Weeks 2 to 4: Early Recovery
Vision may fluctuate from one day to the next as the cornea heals and remodels. Dryness and variable clarity are normal. Contact lenses generally cannot be worn for about one month after the procedure. Avoid swimming, hot tubs, and getting non-sterile water in the treated eye during this phase.
Months 1 to 6: Stabilization
Comfort and visual clarity typically improve steadily over the first three months. Vision generally stabilizes around 6 months, though small improvements can continue for up to a year. Follow-up corneal topography scans confirm the corneal shape has stabilized. Once stable, you can be refitted for updated glasses, contact lenses, or scleral lenses to optimize your vision.
Keratoconus Treatment Options
| Treatment | When It Is Used |
|---|---|
| Eyeglasses | Mild or early stages for basic vision correction |
| Soft contact lenses | Mild stages when glasses are no longer sufficient |
| Rigid gas permeable (RGP) lenses | Moderate stages to create a smooth optical surface over the irregular cornea |
| Scleral lenses | Moderate to advanced stages for improved comfort and excellent vision correction |
| Intacs® (corneal ring segments) | Moderate cases to help reshape the cornea and improve contact lens fit |
| iLink® corneal cross-linking | Progressive keratoconus at any treatable stage to stop disease progression |
| Corneal transplant | Severe or advanced cases when other treatments are no longer effective |
Your iLink® Procedure Step by Step
From preparation through post-treatment care, here is what happens at each stage
Preparation and Numbing
Numbing eye drops are applied to keep you comfortable. You remain awake throughout the procedure. A mild oral sedative may be offered if you feel anxious. Your doctor positions your head and uses a small device to gently keep your eyelids open.
Epithelium Removal
Using a gentle instrument, your doctor carefully removes a thin outer layer of the corneal surface called the epithelium. This "epi-off" approach is the FDA-approved technique and allows the riboflavin solution to penetrate deeply into the corneal stroma where the cross-linking reaction takes place.
Riboflavin Drops
Photrexa® Viscous riboflavin drops are applied at regular intervals over approximately 30 minutes. The riboflavin soaks into the corneal tissue and serves as both the photosensitizer for the cross-linking reaction and a protective UV absorber for deeper eye structures like the lens and retina.
UV-A Light Exposure
A precisely calibrated UV-A light from the KXL® System is directed at the cornea for approximately 30 minutes. Additional riboflavin drops are applied every two minutes during this phase. The UV-A light activates the riboflavin, creating the new cross-links between your collagen fibers.
Bandage Lens and Post-Care
A soft bandage contact lens is placed on the treated eye to protect the corneal surface as the epithelium regenerates. Your doctor prescribes antibiotic drops to prevent infection and anti-inflammatory drops to reduce swelling. You receive detailed home care instructions before leaving.
Follow-Up Visits
You will return for follow-up visits within the first week and at regular intervals over the next several months. These visits allow your doctor to monitor healing, remove the bandage lens, and use corneal topography to confirm that the cornea is stabilizing as expected.
Insurance Coverage for iLink®
Widely Covered by Insurance
More than 95 percent of the commercially insured population in the United States has access to coverage for the FDA-approved iLink® procedure. All 50 states have at least six insurance plans that cover the treatment. Major insurers include UnitedHealthcare, Blue Cross Blue Shield, Aetna, Cigna, and Humana, among many others.
Prior authorization is typically required, and your doctor will need to provide documentation showing that your keratoconus is progressing. Our billing team at Greenwich Ophthalmology Associates has extensive experience navigating insurance approvals and will help you understand your benefits before the procedure.
FDA-Approved vs. Unapproved Cross-Linking
Because iLink® is the only FDA-approved cross-linking procedure, it is the version that insurance covers. If a different provider tells you that cross-linking requires full out-of-pocket payment (potentially $6,500 or more per eye), it may be because they use an unapproved alternative with compounded or imported riboflavin that has not been reviewed by the FDA for safety or effectiveness.
In that situation, we encourage you to seek a second opinion from a provider who offers the FDA-approved procedure. Billing insurance for an unapproved procedure may be illegal, and it may not be covered by the provider's malpractice insurance. Contact us to learn more about your coverage options.
Why FDA Approval Matters
Not all cross-linking procedures are the same. Here is how the FDA-approved iLink® system compares to unapproved alternatives.
| Feature | iLink® (FDA-Approved) | Unapproved Cross-Linking |
|---|---|---|
| FDA Status | Approved since April 2016 with clinical trial data | Not FDA-approved; safety and effectiveness not formally reviewed |
| Insurance Coverage | Covered by over 95% of commercial plans | Typically not covered; billing insurance may be illegal |
| Riboflavin Used | FDA-approved Photrexa® and Photrexa® Viscous | Unapproved compounded or imported products |
| Cost to Patient | Typically covered by insurance; copay assistance available | Full out-of-pocket, potentially $6,500+ per eye |
| Adverse Event Reporting | Documented and tracked through FDA channels | No requirement to report adverse events |
| Malpractice Coverage | Covered by OMIC and major ophthalmic liability insurers | May not be covered by malpractice insurance |
Frequently Asked Questions
Common questions about iLink® corneal cross-linking answered by our cornea team
What is the iLink® cross-linking procedure?
Is corneal cross-linking painful?
How long is the recovery after iLink®?
Can cross-linking improve my vision?
How do I know if my keratoconus is progressing?
What happens if I do not get treatment?
Does iLink® work for post-LASIK ectasia?
Is iLink® covered by my insurance?
Can both eyes be treated at the same time?
What are the risks of corneal cross-linking?
Protect Your Vision with iLink® Cross-Linking
Schedule a keratoconus evaluation with our fellowship-trained cornea specialists to find out if iLink® is the right treatment for you. Early intervention offers the best outcomes.
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