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What Is Dellen Keratopathy?

Dellen keratopathy refers to a localized area of corneal thinning and dehydration that develops adjacent to an elevation near the limbus. The elevation, such as a pinguecula, pterygium, scleral buckle, or filtering bleb, disrupts the normal tear film flow over the cornea. The affected area becomes dry, slightly depressed, and hazy, forming a dellen. Although often small, it can cause discomfort and, rarely, lead to more serious ulceration if neglected.

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What Is Dellen Keratopathy?

Dellen keratopathy refers to a localized area of corneal thinning and dehydration that develops adjacent to an elevation near the limbus. The elevation, such as a pinguecula, pterygium, scleral buckle, or filtering bleb, disrupts the normal tear film flow over the cornea. The affected area becomes dry, slightly depressed, and hazy, forming a dellen. Although often small, it can cause discomfort and, rarely, lead to more serious ulceration if neglected.

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Causes of Dellen Keratopathy

Dellen form when a limbal or conjunctival elevation shelters a portion of the peripheral cornea from normal tear wetting. Common causes include large pingueculae, advancing pterygia, postoperative blebs after glaucoma surgery, and scleral buckling elements. Conjunctival scarring, chemosis, or masses can create similar shadows. Reduced blinking, dry eye, or exposure can worsen the dehydration. The underlying issue is mechanical disruption of the local tear film.

Symptoms and Clinical Features

Patients may notice mild foreign body sensation, dryness, or localized redness near the limbus. Vision is usually unaffected because dellen are peripheral and small. On slit lamp exam, a shallow, saucer shaped depression with thinning and stromal haze is seen next to a raised lesion. The overlying epithelium may be intact or show punctate staining with fluorescein. Adjacent conjunctiva often looks injected. In more advanced cases, an epithelial defect or ulcer can develop within the dellen.

How Is Dellen Keratopathy Diagnosed?

Diagnosis is clinical and based on the presence of a peripheral corneal depression next to a limbal elevation that disturbs tear flow. Fluorescein dye highlights surface dryness and any epithelial break. The examiner evaluates lid closure, blink pattern, and tear quality. Corneal pachymetry can document localized thinning when needed. Distinguishing dellen from infectious peripheral ulcers is important, as dellen usually lack infiltrate and respond to lubrication.

How Is Dellen Keratopathy Managed?

Treatment focuses on rehydrating the cornea and improving tear coverage. Frequent preservative free lubricating drops and thick ointments are used, sometimes along with patching or a bandage contact lens to retain moisture. Addressing the underlying elevation, such as reducing conjunctival chemosis or surgically modifying a prominent bleb or pinguecula, may be required. Short courses of topical steroids can help with associated inflammation when infection is excluded. Most dellen resolve with aggressive lubrication and protection.

FAQs About Dellen Keratopathy

Can dellen keratopathy cause permanent damage?

Most cases resolve without lasting harm when treated early, but prolonged dehydration and thinning can lead to scarring or even perforation in rare situations. Early recognition and generous lubrication are the best safeguards.

Do dellen always need surgery on the adjacent lesion?

Not always. Many dellen heal with lubrication and temporary protective measures while the adjacent elevation is left alone. Surgery is considered when the lesion is large, symptomatic, or repeatedly causes dellen despite good surface care.

How quickly does a dellen improve with treatment?

Symptoms often ease within days, while full structural recovery can take longer. Regular follow up allows adjustments in lubrication and confirms that thinning is reversing. Persistent defects prompt reassessment for infection or other causes.

Can I wear contact lenses if I have a dellen?

Standard contact lenses are usually paused during active dellen treatment. In some cases, a bandage lens is prescribed specifically to protect the area under close supervision. Long term lens plans should be discussed with the eye doctor once the cornea is stable.