Treating Corneal Ectasia with Scleral Lenses
What Is Corneal Ectasia?
Corneal ectasia refers to a group of conditions that weaken the cornea, the clear front surface of the eye, causing it to thin and bulge in an irregular shape. This irregular shape scatters incoming light rather than focusing it clearly, leading to distorted vision that worsens over time.
The two most common forms of spontaneous ectasia are keratoconus and pellucid marginal degeneration. In keratoconus, the cornea steepens into a cone shape, typically in the center or lower half. In pellucid marginal degeneration, thinning occurs along the lower edge of the cornea, causing a different but equally disruptive pattern of distortion. Both conditions develop on their own and tend to progress gradually over time.
Ectasia can also develop after refractive surgery such as LASIK or PRK, procedures that reshape the cornea by removing tissue. When too much tissue is removed or the cornea was already at risk, the remaining structure may weaken and begin to bulge forward over months or years. The vision changes that follow are similar to those seen in keratoconus, including blurring, ghosting, and increasing sensitivity to light.
The irregular surface created by ectasia produces a type of distortion called irregular astigmatism. Glasses can correct regular astigmatism, but they cannot compensate for the unpredictable surface changes caused by a bulging cornea. Patients often describe seeing halos or starbursts around lights at night, ghosting around letters or objects, and a progressive loss of their best possible vision that no updated glasses prescription can resolve.
Stopping Progression with Corneal Cross-Linking
Before vision can be fully restored, the ectasia must be stabilized. Corneal collagen cross-linking (CXL) is the most established treatment for halting ectasia progression, and it is often the first step in a longer-term management plan.
CXL works by creating new chemical bonds between collagen fibers inside the cornea, the stroma. This is done by applying riboflavin drops (vitamin B2) to the corneal surface and then exposing it to a precise amount of ultraviolet light. The combination activates the riboflavin, triggering bonding reactions that stiffen the corneal tissue and help it resist further bulging. The goal is not to reshape the cornea but to stop it from getting worse.
Cross-linking is performed as an outpatient procedure and typically takes about one hour. Your eye doctor numbs your eye with drops and removes a thin layer of corneal surface cells before applying the riboflavin. A bandage contact lens is placed over the eye for several days while the surface heals. Vision is often blurry for the first few weeks, and the full benefit of the treatment can take several months to become clear as the cornea settles.
CXL is very effective at halting ectasia progression, with strong long-term results in most patients. However, it is important to understand that cross-linking stabilizes the cornea rather than restoring its shape. The irregular surface that developed before treatment usually remains, which is why most patients still need specialty contact lenses after the procedure to achieve clear vision.
Restoring Vision with Scleral Lenses
Once the cornea has been stabilized, scleral lenses are often the most effective way to restore sharp, comfortable vision. Our specialty lens team has extensive experience fitting patients with ectasia, and we use advanced diagnostic tools to customize every lens to the individual eye.
Unlike standard soft contact lenses, scleral lenses are large-diameter rigid lenses that vault completely over the cornea and rest on the white part of the eye, the sclera. The space between the back of the lens and the irregular corneal surface is filled with preservative-free saline. This fluid layer smooths out all the bumps and valleys of the distorted cornea, creating a perfectly uniform optical surface. The rigid lens material then refracts light predictably, delivering the kind of crisp, stable vision that neither glasses nor soft lenses can provide.
The most effective strategy for managing ectasia typically combines CXL to stop progression with scleral lenses to correct the residual vision distortion. CXL addresses the structural problem while scleral lenses address the optical one. This two-part approach is widely used for both keratoconus and post-surgical ectasia, and our team coordinates care so that each part of your treatment is timed and sequenced properly.
Your eye doctor will wait for your cornea to fully stabilize after cross-linking before beginning the scleral lens fitting process. This typically means waiting several months and confirming through corneal topography scans (detailed maps of your corneal surface) that the shape has stopped changing. Fitting lenses before the cornea has settled can result in a lens that no longer fits correctly once healing is complete, so patience at this stage leads to a better long-term outcome.
Scleral lens fitting for ectasia requires specialized training and experience. Our optometry team includes eye doctors with deep expertise in fitting complex lenses for irregular corneas.
- Dr. Paul Zerbinopoulos has been fitting scleral lenses since 2008 and is a past president of the Rhode Island Optometric Association
- Dr. Earle Scharff brings over 40 years of experience fitting rigid gas permeable, multifocal, toric, and scleral lenses
- Dr. Lori Boivin specializes in complex lens fittings and trained at Massachusetts Eye and Ear
Together, our optometry team fits patients with a full range of specialty lenses, including scleral lenses, rigid gas permeable (RGP) lenses, toric lenses, and orthokeratology lenses, for conditions including keratoconus, post-surgical ectasia, severe dry eye, high prescriptions, and irregular corneas.
Additional Treatment Options for Ectasia
Depending on the severity and pattern of your ectasia, your eye doctor may discuss surgical options that can be combined with cross-linking or used to prepare the cornea for a better contact lens fit.
Intracorneal ring segments (ICRS) are small, curved plastic implants placed within the layers of the cornea to help flatten and regularize the cone shape. They work by redistributing tension in the corneal tissue to reduce the amount of irregular astigmatism. ICRS can be combined with CXL to reshape the cornea before contact lens fitting. In most cases, patients still need specialty lenses after the procedure, but an improved corneal shape can make fitting easier and vision more comfortable.
Some patients benefit from a combination of procedures tailored to their specific pattern of ectasia. CXL combined with a surface-smoothing laser treatment called PRK can reduce surface irregularities while strengthening the underlying tissue. CXL combined with ICRS addresses both the shape and the structural stability of the cornea at the same time. Our cornea specialists, including Dr. Jane Cook, Dr. Christopher Newton, and Dr. Elliot Perlman, evaluate each patient individually to determine whether a combined surgical approach may improve outcomes before contact lens fitting begins.
When ectasia has progressed to the point where the cornea is severely thinned, scarred, or no longer suitable for cross-linking or lenses, a corneal transplant may be recommended. Modern transplant techniques allow surgeons to replace only the affected layers of the cornea rather than the entire thickness, which speeds recovery and reduces rejection risk. After a transplant heals, many patients still benefit from scleral lenses to correct the residual irregularity of the donor tissue junction, but they gain a structurally stable foundation for long-term vision management.
Frequently Asked Questions
Here are answers to questions our patients commonly ask about ectasia treatment and the process of moving from diagnosis to clear vision.
Not necessarily. Your eye doctor will first determine whether your ectasia is actively progressing using corneal topography measurements taken over time. If your cornea has been stable for an extended period, scleral lenses alone may be appropriate. If scans show the cornea is still steepening, cross-linking is typically recommended first to protect the gains that scleral lenses will provide. Fitting lenses over a cornea that is still changing can lead to rapid prescription shifts and the need for early refitting.
Cross-linking is designed to stop further progression, not to reverse the changes that have already occurred. The clarity of your vision after CXL depends on how much irregularity developed before treatment began, which is one reason early diagnosis and intervention matter. Scleral lenses are typically needed to bridge the gap between your stabilized but still irregular cornea and fully functional vision.
The underlying mechanism is different since post-LASIK ectasia results from surgical thinning while keratoconus develops on its own, but the management approach is very similar. Both conditions are treated with cross-linking to halt progression and scleral lenses to restore vision over the irregular surface. Your eye doctor will review your surgical history and corneal maps to plan care that is appropriate for your specific situation, since the location and pattern of thinning may influence which lens design works best.
Your eye doctor will schedule follow-up corneal topography scans at regular intervals after CXL to monitor for any changes in corneal shape. Signs that may prompt closer evaluation include a contact lens that no longer fits well, a prescription that has shifted, or new visual symptoms like increased ghosting or glare. It is important to keep all follow-up appointments even when your vision feels stable, since topography changes can appear before symptoms do.
Most patients adapt to scleral lenses within a few weeks, though the timeline varies depending on your sensitivity and how different the lenses feel from any contacts you have worn before. The insertion and removal technique takes practice, and our team will guide you through it in detail before you leave your fitting appointment. Many patients with ectasia report that once adapted, scleral lenses are more comfortable than other lens types they have tried because the lens does not touch the irregular corneal surface.
A small number of patients may experience continued progression after CXL, particularly if the treatment did not penetrate deeply enough or if underlying risk factors remain. In these cases, your eye doctor will discuss whether a repeat procedure, a combined surgical approach, or a different management strategy is appropriate. Regular monitoring is the key to catching any renewed steepening early, before it reaches a stage where more complex intervention is needed.
See Our Team at Rhode Island Eye Institute
If corneal ectasia is affecting your vision and your current glasses or contact lenses are no longer giving you clear, stable sight, our team is here to help. Rhode Island Eye Institute brings together fellowship-trained cornea specialists and experienced specialty lens fitters under one roof, so your care is fully coordinated from stabilization through optical correction. We welcome patients from across Rhode Island and southeastern Massachusetts and look forward to helping you find a path to clearer vision.