Scleral Lenses for Neurotrophic Keratitis
What Neurotrophic Keratitis Does to Your Eyes
Neurotrophic keratitis develops when the trigeminal nerve stops sending signals to your cornea. This nerve controls corneal sensation, tear production, and the healing response that repairs surface damage. When it fails, your cornea loses the ability to detect injury and repair itself.
Several conditions can damage the trigeminal nerve. Herpes simplex and herpes zoster infections are the most common causes. Stroke, brain tumors, acoustic neuroma surgery, diabetes, and certain eye surgeries can also interrupt the nerve pathway to your cornea.
Your cornea cannot feel pain when nerve damage is present, so you may miss early warning signs. Blurred or fluctuating vision, redness, and surface dryness are often the first clues. Some people notice their eyes watering more than usual even though the corneal surface stays dry.
- Vision that worsens over weeks or months without obvious cause
- Redness that does not improve with over-the-counter drops
- A white or gray spot visible on the front of your eye
- Reduced ability to sense touch on your eye surface
Eye doctors grade neurotrophic keratitis in three stages. Stage 1 produces dry, irregular surface changes on the cornea. Stage 2 advances to a persistent wound that refuses to close despite standard treatment. Stage 3, the most severe phase, can cause the cornea to thin, melt, or perforate.
Each stage calls for prompt treatment because your cornea cannot send pain signals to alert you. Regular eye exams catch damage you cannot feel, making ongoing monitoring essential for anyone at risk.
Seek same-day evaluation if you notice a new white spot on your cornea, sudden vision changes, or worsening redness. Thick or colored discharge also warrants immediate attention. Because your cornea may not register discomfort, check your eyes in a mirror each day to spot visible changes early.
People with a history of herpes eye infections, facial nerve surgery, or diabetes should schedule regular corneal evaluations even when their eyes seem healthy.
How Scleral Lenses Protect and Heal Your Cornea
A scleral lens vaults over your entire cornea and rests on the sclera (the white part of your eye). You fill the lens with preservative-free saline before insertion, creating a liquid cushion that bathes your cornea in moisture all day. This reservoir replaces the protective tear film that your damaged nerves can no longer maintain.
Researchers reviewing all published case reports and case series found that scleral lens wear healed epithelial defects that had not responded to other treatments, with improved visual acuity and quality of life in every reviewed case (PubMed, 2020).
Neurotrophic keratitis often leaves your corneal surface rough and uneven, scattering light and blurring your vision. The fluid layer between the scleral lens and your cornea acts as a smooth new optical surface. Light passes through this liquid evenly, producing sharper images on your retina.
In one published case, a patient achieved visual acuity of 20/60 with complete resolution of monocular diplopia (double vision from one eye) after starting scleral lens wear (Clinical Insights in Eyecare, 2024).
The AAO lists scleral lenses as one of two primary treatment options for neurotrophic keratitis, alongside cenegermin, a nerve growth factor eye drop (AAO EyeNet, 2022). The largest prospective case series followed 24 eyes with neurotrophic keratopathy managed with scleral lenses and reported positive healing outcomes (PubMed, 2020).
Your eye doctor uses the scleral lens as both a vision correction device and a therapeutic bandage, addressing impaired vision and a cornea that cannot heal on its own in one treatment.
The FDA approved cenegermin for neurotrophic keratitis treatment. Your doctor may prescribe this medication alongside scleral lens wear. The lens reservoir can deliver topical agents to the corneal surface, which may improve how the medication reaches damaged tissue (PMC, 2022).
This combination targets two problems at once: cenegermin works to restore corneal nerve function while the scleral lens shields and hydrates the surface during recovery.
What to Expect During Fitting and Daily Wear
Your eye doctor will map your cornea and sclera using specialized imaging to determine the right lens diameter, curvature, and vault height. The fitting may take several visits to refine, especially if your corneal surface has become irregular from the disease.
If you have an active epithelial defect, your doctor will prioritize a lens design that maximizes corneal protection and fluid retention. Optical precision becomes the focus once your surface has stabilized.
You fill the scleral lens with preservative-free saline and place it on your eye using a suction cup or your fingertips. To remove it, you break the seal between the lens edge and your eye with a small plunger device. Most people learn the technique within a few practice sessions at their doctor's office.
Because your cornea has reduced sensation, follow a strict wearing schedule rather than relying on discomfort as a cue to remove the lens. Your eye doctor will set specific wear times based on your healing stage and overall corneal health.
During the initial phase, your doctor may see you every few days to check healing under the lens. These frequent visits let your doctor adjust the fit, watch for infection, and track whether the epithelial defect is closing.
Once your cornea stabilizes, visits shift to every three to six months. Long-term scleral lens wearers with neurotrophic keratitis need ongoing monitoring because the underlying nerve damage can cause new surface problems over time.
Questions About Scleral Lenses for Neurotrophic Keratitis
The amount of vision recovery depends on how much scarring or structural damage your cornea sustained before treatment started. Many patients gain meaningful improvement, but corneal scars from advanced disease may limit the final result. Starting treatment earlier tends to produce better visual outcomes.
Most patients wear their lenses for 8 to 16 hours per day, but your doctor will set a personalized schedule. During active wound healing, your doctor may adjust wear times and monitor you more often.
Many patients use scleral lenses long-term because the underlying nerve damage may not recover. If treatments like cenegermin restore enough corneal sensation and tear function, your doctor may reassess whether continued lens wear remains necessary.
Cloudiness usually means debris, proteins, or mucus have accumulated in the saline reservoir. Remove the lens, rinse it with approved solution, and reinsert with fresh saline. If this happens often, your doctor may modify the lens design or add a surface coating to reduce buildup.
You can apply preservative-free rewetting drops over your scleral lenses. Some doctors place medicated drops in the lens reservoir before insertion to enhance drug delivery to the cornea. Confirm with your doctor which medications are safe to use with your lenses.
Examine your eyes in a mirror each morning before insertion and each evening after removal. Look for redness, white spots, discharge, or swelling. Track your vision quality each day, since a sudden drop in clarity may signal a problem your cornea cannot feel. Report any visual or visible changes to your doctor the same day.
Take the Next Step for Your Corneal Health
If you have neurotrophic keratitis, ask your eye doctor whether scleral lenses can protect your cornea and improve your vision. Early treatment gives your cornea the best chance to heal and maintain long-term comfort.