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What Is Exposure Keratitis?

Exposure keratitis is damage to the corneal surface caused by inadequate coverage or blinking of the eyelids. When the lids do not close fully, the tear film evaporates quickly and the exposed epithelium dries out and breaks down. This leads to punctate staining, epithelial defects, and sometimes ulceration, especially in the inferior cornea. Causes include facial nerve palsy, proptosis, eyelid retraction, and nocturnal lagophthalmos. Without protection, vision threatening infection and scarring can follow.

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What Is Exposure Keratitis?

Exposure keratitis is damage to the corneal surface caused by inadequate coverage or blinking of the eyelids. When the lids do not close fully, the tear film evaporates quickly and the exposed epithelium dries out and breaks down. This leads to punctate staining, epithelial defects, and sometimes ulceration, especially in the inferior cornea. Causes include facial nerve palsy, proptosis, eyelid retraction, and nocturnal lagophthalmos. Without protection, vision threatening infection and scarring can follow.

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Causes and Risk Factors for Exposure Keratitis

Facial nerve palsy from Bell's palsy, stroke, or tumors can weaken orbicularis function and limit lid closure. Thyroid eye disease, shallow orbits, and large globe size can push the eye forward and leave more surface exposed. Eyelid retraction after surgery, trauma, or scarring also contributes. Some people sleep with their lids partially open and develop nocturnal exposure. Reduced corneal sensation and poor Bell's phenomenon raise risk because the eye does not protect itself effectively.

Symptoms and Clinical Features

Patients may complain of dryness, burning, foreign body sensation, and blurred vision that worsens toward the end of the day. Bed partners sometimes notice that the eyes stay partly open during sleep. On slit lamp exam, there is inferior or interpalpebral punctate epithelial staining, filaments, or larger epithelial defects in the exposed zone. The tear film looks thin and unstable, and the conjunctiva may be injected. Observation of blink pattern and lid closure is a key part of the exam.

How Is Exposure Keratitis Diagnosed?

Diagnosis is clinical and based on the pattern of staining and obvious or subtle incomplete closure. The eye doctor asks about facial weakness, recent surgery, thyroid disease, and sleep habits. Fluorescein staining highlights exposure related defects, often with a sharp upper border at the lid margin. The snap back test and lid position measurements help document mechanical problems. Imaging and neurologic or endocrine workup are pursued when systemic causes are suspected.

How Is Exposure Keratitis Managed?

Treatment aims to keep the cornea moist and reduce exposure, while underlying causes are addressed. Frequent lubricating drops by day and thicker gels or ointments at night are standard. Moisture goggles, eyelid taping during sleep, or temporary patching are used when exposure is significant. In facial nerve palsy, temporary tarsorrhaphy, gold weight implants, or lid tightening procedures can improve closure. Protecting the cornea early prevents deeper ulcers and infection.

FAQs About Exposure Keratitis

Can exposure keratitis go away on its own?

Mild cases may improve if temporary causes such as Bell's palsy recover, but the cornea still needs protection during that period. Permanent lid or orbital problems usually need ongoing measures or surgery.

Is exposure keratitis painful?

It often causes burning and gritty discomfort, but pain can be surprisingly mild in people with reduced corneal sensation. That makes regular exams important in high risk patients.

Why is eye taping at night sometimes recommended?

Taping keeps the lids gently closed during sleep, which reduces drying in people who cannot close fully on their own. It is usually combined with lubricating ointment for extra protection.

Will I always need surgery for exposure keratitis?

Not always. Some patients do well with lubricants, shields, and taping, especially when the cause is expected to improve. Surgery is considered when exposure is severe, long term, or not controlled with conservative steps.