Scleral Lenses for Persistent Epithelial Defects: Maintaining a Healing Environment
What Are Persistent Epithelial Defects
A persistent epithelial defect is a breakdown in the outermost layer of your cornea that fails to heal within two to three weeks despite standard treatment. The epithelium is the protective surface that normally repairs itself within days after injury, but certain conditions interfere with this natural healing process. When healing stalls, your cornea remains vulnerable to infection, scarring, and progressive damage that can threaten your vision.
These defects often begin as small injuries from trauma, surgery, or dry eye disease but refuse to close even with conventional therapies. The exposed corneal tissue becomes a gateway for bacteria and other harmful organisms, making prompt and effective treatment essential. A persistent epithelial defect is diagnosed only after excluding active infection and ensuring no progressive stromal involvement that would require different management.
You may notice a range of uncomfortable sensations when you have a persistent epithelial defect. Pain is often the most prominent symptom, ranging from mild irritation to severe discomfort that makes it difficult to keep your eye open. The pain may worsen with blinking or when moving your eye.
- A constant gritty or foreign body sensation in the affected eye
- Excessive tearing or watery discharge
- Sensitivity to light that makes it hard to tolerate bright environments
- Blurred or fluctuating vision that does not improve with blinking
- Redness and visible irritation on the white part of your eye
Certain symptoms signal that your defect may be developing dangerous complications. If you experience sudden worsening of pain, especially if it becomes severe, contact our office immediately. This could indicate an infection or deeper involvement that requires urgent intervention.
Other red flags include thick yellow or green discharge, significant vision loss that does not clear, white or cloudy spots appearing on your cornea, or severe light sensitivity accompanied by intense eye pain. These signs suggest your defect may be progressing or becoming infected, and we need to evaluate you as soon as possible.
Several underlying health conditions impair your cornea's natural ability to heal. Diabetes compromises blood flow and cellular repair mechanisms throughout your body, including your eyes. Severe dry eye disease leaves your corneal surface chronically under-nourished and vulnerable to breakdown.
- Autoimmune disorders such as rheumatoid arthritis or Sjogren syndrome that cause inflammation
- Previous corneal surgeries or injuries that have weakened the epithelial layer
- Neurotrophic keratopathy, a condition where damaged nerves reduce corneal sensation
- Exposure keratopathy from incomplete eyelid closure, lagophthalmos, or facial nerve palsy
- Herpetic eye disease that can impair corneal sensation and healing
- Chemical injury or limbal stem cell deficiency affecting cell regeneration
- Preservative toxicity or medication toxicity from long-term topical drops including glaucoma medications
- Topical medication misuse such as NSAID or anesthetic abuse that can delay epithelial healing
- Eyelid margin disease or chronic blepharitis affecting the tear film and surface health
- Recurrent corneal erosion syndrome characterized by repeated epithelial breakdown
Standard approaches to healing epithelial defects include lubricating drops, antibiotic ointments, and bandage contact lenses. These methods do not always succeed. Frequent blinking repeatedly traumatizes the healing tissue. This prevents cells from establishing stable connections.
Traditional bandage lenses can move across the cornea with each blink. This creates shearing forces that disrupt fragile new growth. Many conventional treatments also fail to maintain consistent hydration at the defect site. Air exposure during the day dries the healing tissue. Eyelid movement at night can mechanically remove newly formed cells before they anchor properly. When these therapies do not lead to complete healing, we look to more advanced options like therapeutic scleral lenses.
How Scleral Lenses Create a Protective Healing Environment
Scleral lenses are larger specialty contact lenses that vault completely over your cornea and rest on the white part of your eye called the sclera. Unlike standard contact lenses that sit directly on the corneal surface, scleral lenses create a space between the lens and your cornea. This unique design keeps the lens from touching your injured corneal tissue, greatly reducing mechanical friction during blinking.
The lens diameter ranges from 14 to 24 millimeters, significantly larger than traditional contacts. Because the lens edges land on the less sensitive sclera rather than the delicate cornea, many patients find them more comfortable despite their size.
When you insert a scleral lens, we first fill it with preservative-free sterile saline solution. This fluid fills the space between the lens and your cornea, creating a liquid reservoir that bathes your epithelial defect continuously throughout the day. The constant moisture environment helps support cellular repair and regeneration.
- The fluid layer prevents your cornea from drying out between blinks and shields it from evaporative stress
- Healing cells receive steady hydration and protection from the stable fluid environment
- The buffered space dilutes surface stressors and reduces direct mechanical trauma
- Tear exchange under scleral lenses is limited, so debris and inflammatory substances may accumulate in the reservoir over time
- If the reservoir becomes cloudy or debris-filled during the day, our eye doctor may instruct you to remove the lens, rinse, and refill it for a midday refresh
Every time you blink, your eyelid sweeps across your eye at high speed. This generates significant shearing forces. For a healing epithelial defect, these repetitive mechanical stresses can tear away newly formed cells before they attach securely.
Scleral lenses act as a rigid protective shield that absorbs these forces. Because the lens vaults over your cornea without touching it, your eyelid glides across the smooth outer surface of the lens instead of dragging across your healing wound. This protection continues with every blink throughout your waking hours, giving your cornea a more stable environment it needs to complete the healing process.
Compared to standard bandage contact lenses, scleral lenses provide enhanced protection because they demonstrate minimal movement on the eye and maintain a much thicker fluid reservoir. Surgical options like amniotic membrane transplantation or tarsorrhaphy are also available, and the choice depends on the specific cause and severity of your defect. Scleral lenses offer a non-invasive alternative that may be started after thorough evaluation and fitting.
- You can remove the lenses daily for cleaning, reducing infection risk compared to extended-wear bandage lenses
- The custom fit aims for optimal vault and fluid depth for your specific defect
- You avoid the recovery time and risks associated with surgical interventions
- We can combine scleral lens therapy with other treatments like specialized eye drops for enhanced healing
Your Evaluation and Fitting Appointment
We begin with a comprehensive examination to assess your epithelial defect and overall eye health. Using a slit lamp microscope, our eye doctor examines your cornea in detail and measures the size and location of your defect, and whether there is any stromal involvement such as thinning, infiltrate, or signs of infection. We apply a safe orange dye called fluorescein that highlights damaged areas under blue light, allowing us to map the injury precisely.
Additional testing helps us identify underlying conditions contributing to delayed healing. We measure your tear production and quality, evaluate your corneal sensitivity, and check for signs of infection or inflammation. If infection is suspected, we may take cultures. We may also use anterior segment optical coherence tomography or pachymetry to assess corneal thickness and involvement. These findings guide our treatment plan and help us predict how well scleral lenses will support your healing.
Not every patient with a persistent epithelial defect is an ideal candidate for scleral lens therapy. We consider the size and location of your defect, your manual dexterity for lens handling, and your ability to follow the care routine. Suspected microbial keratitis, active corneal infiltrate, or progressive stromal thinning and melt are reasons to defer or avoid scleral lens wear until the condition is stabilized and closely supervised. Active infections must be treated and controlled before we can fit therapeutic lenses.
- Your defect should be persistent despite at least two weeks of conventional treatment
- You need sufficient cognitive and physical ability to insert and remove lenses safely
- Your ocular surface must be stable enough that a scleral lens will not cause additional damage
- You should have realistic expectations about healing timelines and the need for consistent lens wear
- Relative cautions include poor hygiene or handling ability, inability to attend frequent follow-up appointments, severe conjunctival chemosis, and uncontrolled blepharitis
Fitting scleral lenses for therapeutic purposes requires specialized expertise and careful measurements. Our eye doctor uses advanced imaging technology to map the unique shape of your cornea and sclera. We measure the curvature, diameter, and contour of your eye. This helps us design a lens that vaults appropriately over your defect without touching it.
The fitting often takes longer than fitting standard contact lenses because we must balance several factors. The lens must maintain adequate clearance over your entire cornea. It should land gently on your sclera without causing blanching or compression. It also needs to allow proper tear exchange at the lens edge. We may try several diagnostic lenses during your visit to find the optimal parameters.
We start with trial lenses that closely match your initial measurements. After you wear a trial lens for 15 to 30 minutes, we reassess the fit using the slit lamp and specialized imaging. We look for the appropriate fluid reservoir depth, proper lens centration, and appropriate edge alignment with your sclera.
- We check that the lens does not touch your cornea anywhere, especially over the defect
- Our eye doctor evaluates how the lens moves or settles as you blink and look in different directions
- We measure the fluid layer thickness to ensure sufficient but not excessive clearance
- You provide feedback about comfort and vision quality with each trial lens
- We order your custom lenses once we achieve the optimal fit parameters
Daily Use and Care of Your Therapeutic Scleral Lenses
Our staff will teach you the proper insertion and removal techniques during your fitting appointment. For insertion, you will use a small suction holder called a plunger that makes handling the large lens easier. You fill the lens bowl with preservative-free saline, lean over a mirror, and gently apply the lens to your eye in one smooth motion.
Removal requires a different plunger designed to create suction on the lens surface. You look straight ahead, hold your eyelids open, and carefully place the removal plunger on the lower edge of the lens. A gentle pull breaks the seal and lifts the lens off your eye. We will have you practice several times before you leave our office to ensure you feel confident.
Proper lens care is essential for preventing eye infections, especially when your cornea has an open wound. Preservative-free sterile saline is used for filling the lens before insertion and sometimes for a final rinse if we recommend it. Cleaning and disinfection require different products. Each night after removing your lenses, you must use a surfactant cleaner designed for rigid gas permeable lenses. Gently rub each lens surface with your clean fingers and the recommended cleaning solution to remove protein deposits and debris. Then disinfect your lenses using an approved system, such as a hydrogen peroxide-based disinfecting solution or a GP-approved multipurpose disinfection regimen, according to the specific protocol we prescribe.
- Never use tap water on your lenses, as it contains organisms that can cause serious infections
- Store your lenses overnight in fresh disinfecting solution in a clean case; never top off old solution
- Replace your lens case every one to three months to prevent biofilm buildup
- Always wash and dry your hands completely before handling your lenses
- Clean and air-dry your insertion and removal plungers after each use, and replace them periodically as directed
- Never reuse single-use saline vials, and do not allow the vial tip to touch any surface
- Do not rinse or store lenses in water or non-sterile saline
- If using hydrogen peroxide disinfection systems, ensure complete neutralization before inserting lenses into your eyes
- Follow the specific product recommendations we provide based on your individual needs
For therapeutic use, we typically recommend wearing your scleral lenses during all waking hours. Consistent lens wear provides continuous protection and moisture to your healing defect, maximizing the chances of successful closure. Most patients wear their lenses for 12 to 16 hours per day, removing them only at bedtime.
Never sleep in your therapeutic scleral lenses unless our eye doctor specifically instructs you to do so for your particular case. Overnight wear dramatically increases infection risk and can lead to corneal swelling. We will give you clear guidance about your specific wearing schedule based on your defect and healing progress.
Before each insertion, you must completely fill the lens bowl with non-preserved sterile saline. Hold the lens in your palm or on the plunger, and fill it to the brim so a slight dome of liquid forms. This ensures no air bubbles get trapped beneath the lens when you apply it to your eye.
Only use preservative-free saline, as preserved solutions can damage your already compromised corneal surface. We may recommend specific brands that have been formulated for scleral lens use. Some patients prefer single-use vials to minimize contamination risk, while others use larger bottles with strict replacement schedules.
Most patients find therapeutic scleral lenses comfortable once they adjust to the sensation. If you notice discomfort, it often means the lens fit needs adjustment or you have an air bubble beneath the lens. Any bubble located over your cornea, especially if it is central or over the defect, can cause focal drying and compromise healing. If you notice a bubble in this area, you should generally remove the lens and reinsert it. Persistent bubbles may indicate your fit needs reassessment.
- Check for air bubbles immediately after insertion by looking in different directions
- Mild initial awareness of the lens edges typically fades within a few days of wear
- Persistent discomfort should prompt you to remove the lens and check for debris or damage
- Redness around the lens edge may indicate the fit is too tight and needs modification
- Foggy vision that develops during wear often signals lens settling and may require a refit
Monitoring Your Progress and Long-Term Management
We typically schedule your first follow-up appointment within 24 to 72 hours of starting scleral lens therapy, then continue with frequent short-interval reviews as you heal. This is especially important for neurotrophic corneas, where reduced sensation may blunt your awareness of complications. At each visit, our eye doctor examines your defect to assess healing progress and checks your lens fit. We use fluorescein dye and slit lamp examination to measure any reduction in defect size and look for signs of healthy epithelial growth.
We also assess for signs of corneal edema or hypoxia, check for any infiltrate or signs of infection, evaluate the anterior chamber for inflammation, and observe how the lens clearance changes after it settles on your eye. These appointments also give us the opportunity to address any problems you are experiencing with lens handling, comfort, or care. We evaluate the condition of your lenses for deposits or damage and make any needed adjustments to your treatment plan. Regular monitoring ensures we catch complications early and optimize your healing environment.
Healing timelines vary widely depending on the underlying cause of your defect and your overall health. Some patients see significant improvement within the first week of scleral lens wear, while others require several weeks or months of continuous therapy. Generally, you may notice decreasing pain and irritation as your defect begins to close, though individual responses differ.
- Week one to two: Initial protection is established and inflammation often decreases
- Week two to four: You may see measurable reduction in defect size as healing progresses
- Week four to eight: Many defects close completely or show substantial improvement
- Beyond eight weeks: Some persistent defects may require additional therapies or evaluation for underlying issues
Scleral lenses work best when combined with other supportive therapies tailored to the cause of your defect. We often prescribe preservative-free lubricating drops to use before and after lens wear. Depending on what is driving your epithelial defect, we may also recommend additional treatments.
- Punctal occlusion to increase tear volume in dry eye disease
- Moisture chamber goggles, taping, or eyelid weights for exposure keratopathy or lagophthalmos
- Amniotic membrane devices or transplantation for certain non-healing defects
- Cenegermin eye drops for neurotrophic keratitis, where available and appropriate
- Autologous serum tears or platelet-rich plasma preparations containing natural growth factors
- Treatment of blepharitis or meibomian gland dysfunction to improve tear film quality
- Antiviral medications if herpetic eye disease is suspected or confirmed
- Avoidance or substitution of toxic topical medications or preservative-containing drops
Do not place medicated drops into the lens reservoir unless our eye doctor specifically instructs you to do so. If you have underlying dry eye disease, we may recommend warm compresses, lid hygiene, or prescription anti-inflammatory medications to improve your tear quality and support healing.
You will likely notice symptom improvement before you can see physical changes in your cornea. Decreasing pain, reduced light sensitivity, and lessening of the gritty sensation all suggest your epithelium is beginning to repair itself. Your vision may become clearer and more stable as the corneal surface smooths.
During examinations, our eye doctor looks for shrinking defect measurements, healthy new epithelial tissue growing in from the edges, and restoration of normal corneal surface characteristics. Proper healing shows organized cell growth without excessive scarring or irregular texture. Complete closure of the defect with restoration of a smooth, stable epithelial layer is our ultimate goal.
Even with therapeutic scleral lenses, complications can occur that require immediate attention. If you experience any of the following red flag symptoms, remove your lens immediately and do not reinsert it unless our eye doctor has provided you with a different emergency plan specific to your situation. Then contact us right away.
- Sudden severe pain, particularly if it is sharp or stabbing in nature
- New or worsening thick yellow or green discharge suggesting possible infection
- Rapid decrease in vision that does not improve when you remove your lens
- New white, gray, or cloudy spots appearing on your cornea
- Intense light sensitivity that prevents you from opening your eyes
- Severe redness or swelling of your eyelids or the tissue around your eye
- Inability to remove your lens or concerns that it may be stuck on your eye
- Bring your lens, case, and solutions to your urgent visit so we can evaluate them and obtain cultures if needed
Risks and Potential Complications of Therapeutic Scleral Lens Use
The most serious concern with any contact lens, especially on a compromised cornea, is microbial keratitis, an infection of the cornea. This risk increases if lenses are not cleaned correctly or if bacteria are introduced during handling. The fluid reservoir can potentially harbor microorganisms or become contaminated, and biofilm can develop on lenses or in cases over time. Neurotrophic eyes are at higher risk because reduced sensation may delay your awareness of worsening infection.
Strict hygiene practices, proper daily disinfection, and regular lens replacement are essential to minimize infection risk. Never use tap water or non-sterile solutions. Always follow the cleaning and disinfection protocol we prescribe, and attend all scheduled follow-up visits so we can monitor for early signs of trouble.
Scleral lenses can reduce the amount of oxygen reaching your cornea, potentially leading to corneal edema or swelling. The degree of risk depends on lens thickness, the depth of fluid clearance, the oxygen permeability of the lens material, and how many hours per day you wear the lenses. Chronic wear may also carry risks of limbal hypoxia and corneal neovascularization in some patients.
We select high-oxygen-transmissible lens materials and optimize your fit to balance adequate corneal clearance with oxygen availability. We monitor your cornea closely at follow-up visits for any signs of edema, and we may adjust your wearing time or lens parameters if needed.
Improper fit or prolonged wear can cause mechanical complications. Excessive suction during lens wear or removal may lead to conjunctival prolapse, visible impression rings on the sclera, or rebound redness after removal. Poor edge alignment can cause discomfort or changes to the conjunctiva and episclera over time. In some cases, fluid stagnation under the lens can lead to debris accumulation or epithelial irregularities sometimes called epithelial bogging.
We carefully assess your lens fit at every visit and make modifications as necessary to prevent these issues. Report any new discomfort, persistent redness, or changes in how your lenses feel during the day.
Some patients, particularly those with glaucoma or ocular hypertension, may experience transient elevation of intraocular pressure related to scleral lens wear. We will monitor your eye pressure if you have risk factors. Allergic reactions to lens care solutions can also occur, and we can help you identify alternative products if you develop sensitivity. Each patient requires individualized monitoring and management to ensure therapeutic scleral lens use remains safe and effective.
Frequently Asked Questions
The duration of therapeutic scleral lens wear depends on how quickly your specific defect heals and what underlying conditions may be slowing your recovery. Some patients need lenses for only a few weeks until their epithelium fully closes, while others with chronic conditions like severe dry eye or neurotrophic keratopathy may benefit from longer-term or even indefinite use to prevent recurrence. We will monitor your progress closely and adjust the plan as your cornea heals.
We generally do not recommend sleeping in scleral lenses because overnight wear significantly increases your risk of serious eye infections and can cause corneal swelling from reduced oxygen supply. In very rare situations, our eye doctor might consider overnight wear for specific cases, but this would only be with close monitoring and clear medical justification tailored to your individual needs.
Coverage varies widely depending on your specific insurance plan and policy details. When scleral lenses are prescribed for therapeutic rather than routine vision correction purposes, many medical insurance plans provide at least partial coverage. Our office can help you understand your benefits and provide the documentation your insurance company needs to process your claim.
If your epithelial defect fails to respond to scleral lens therapy after an appropriate trial period, we will reevaluate you for underlying problems that may be preventing healing. We might need to investigate for undiagnosed conditions, adjust your concurrent medications, or consider additional interventions such as amniotic membrane grafts, surgical procedures to support healing, or other biological therapies that may be appropriate in your case based on current evidence and availability.
While scleral lenses are generally safe when used and cared for properly, any contact lens carries some risk of complications. The most serious concern is microbial keratitis, an infection of the cornea that can occur if lenses are not cleaned correctly or if bacteria are introduced during handling. Other potential issues include corneal swelling from reduced oxygen transmission, allergic reactions to lens care solutions, mechanical problems from improper fit, transient intraocular pressure elevation in some patients, and masking of worsening infection in eyes with reduced sensation. Proper hygiene, correct lens care, appropriate fit, and regular professional monitoring help minimize these risks.
You should not place medicated eye drops into the fluid reservoir when you fill the lens unless our eye doctor specifically instructs you to do so. Some drops can be used on top of the lens or before and after lens wear, but others may not be compatible with lens wear or may accumulate in the reservoir. Always ask us about each medication or drop you use so we can give you specific guidance on timing and application for your individual treatment plan.
Getting Help for Persistent Epithelial Defects
If you have a corneal wound that refuses to heal, therapeutic scleral lenses may offer a protective environment your eye needs for successful recovery. Our eye doctor can evaluate your specific situation, determine whether this treatment approach is appropriate for you, and guide you through every step of the fitting and care process to support your cornea's healing.