Scleral Lenses for Neurotrophic Keratitis

The trigeminal nerve is responsible for giving your cornea the ability to feel sensation, stimulate tear production, and trigger the healing process when the surface is damaged. When this nerve is disrupted, your cornea loses those critical functions.

Several conditions can interfere with trigeminal nerve signaling. Herpes simplex and herpes zoster (shingles) infections are among the most common causes. Stroke, brain tumors, acoustic neuroma surgery, diabetes, and certain eye surgeries can also damage the nerve pathway that keeps your corneal surface healthy.

Because the cornea loses its ability to feel pain, the usual warning signs of eye injury are absent. Patients often notice blurred or fluctuating vision, persistent redness, or surface dryness before they realize something more serious is happening.

• Vision that worsens gradually over weeks or months without a clear cause
• Redness that does not improve with over-the-counter lubricating drops
• A white or gray spot visible on the front of the eye
• Reduced ability to feel touch on the eye surface
• Excessive tearing even though the corneal surface remains dry

If you notice any of these changes, an evaluation with your eye doctor is important even if the eye does not feel uncomfortable.

Eye doctors classify neurotrophic keratitis into three stages based on severity. Stage 1 involves dry, irregular surface changes on the cornea. Stage 2 advances to a persistent wound, known as an epithelial defect, that does not close with standard treatment. Stage 3 is the most serious stage and can lead to corneal thinning, melting, or perforation.

Because the cornea cannot send pain signals to alert you to worsening damage, regular eye exams are essential for anyone at risk. Early detection at a lower stage gives the best opportunity for successful treatment.

Contact your eye doctor the same day if you notice a new white spot on your cornea, sudden vision changes, or rapidly worsening redness. Thick or colored discharge also requires immediate evaluation.

People with a history of herpes eye infections, facial or brain surgery involving the trigeminal nerve, or long-standing diabetes should schedule regular corneal evaluations even when their eyes appear and feel normal. Checking your eyes in a mirror each day helps you spot visible changes early.

Vision recovery depends largely on how much structural damage or scarring occurred before treatment began. The scleral lens improves vision by creating a smooth optical surface over the irregular cornea, but it cannot reverse permanent scarring from advanced disease. Starting treatment at an earlier stage generally leads to better visual outcomes, which is one reason prompt evaluation matters so much with this condition.

Most patients wear scleral lenses for 8 to 16 hours per day, but your eye doctor will set a personalized schedule based on your specific stage of disease and healing progress. During active wound healing, wear times may be adjusted more frequently. Because you cannot rely on discomfort as a guide, following your prescribed schedule closely is especially important.

Many patients with neurotrophic keratitis require long-term scleral lens wear because the underlying nerve damage does not fully resolve on its own. However, if treatments like cenegermin successfully restore enough corneal sensation and tear function, your eye doctor will reassess whether continued lens wear remains necessary. Each patient's situation is different, and your care plan will evolve as your condition changes.

Mid-day cloudiness usually means that debris, proteins, or mucus have collected in the saline reservoir between the lens and the cornea. Remove the lens, rinse it with an approved solution, and reinsert with fresh saline. If fogging happens frequently, your eye doctor may recommend a different lens surface coating or adjust the fit to reduce fluid circulation issues. Never ignore a sudden or significant drop in clarity, as it may indicate a more serious problem.

Establish a daily habit of examining your eyes in a mirror before inserting your lenses each morning and after removing them each evening. Look for new redness, white or gray spots, discharge, swelling, or changes in how your eye looks. Also track your visual clarity each day, since a noticeable drop in sharpness may be the only signal that something has changed. Any visible or visual concern should be reported to your eye doctor the same day, not waited on.

Preservative-free rewetting drops can generally be applied over scleral lenses while they are in place. For medicated drops, some eye doctors place the medication directly in the lens bowl before insertion to improve drug delivery to the corneal surface. However, not all eye drops are safe to use with contact lenses in place, so confirm with your eye doctor exactly which medications should be used before or after lens wear and which can be used with the lens on.