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What Is Bullous Keratopathy?

Bullous keratopathy is a condition in which corneal endothelial failure leads to persistent corneal edema and formation of fluid filled epithelial blisters, or bullae. The swollen cornea becomes cloudy and sensitive, and ruptured bullae cause sharp pain. Common contexts include long standing Fuchs endothelial dystrophy and endothelial damage after intraocular surgery. Without treatment, bullous keratopathy can severely reduce vision and comfort.

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What Is Bullous Keratopathy?

Bullous keratopathy is a condition in which corneal endothelial failure leads to persistent corneal edema and formation of fluid filled epithelial blisters, or bullae. The swollen cornea becomes cloudy and sensitive, and ruptured bullae cause sharp pain. Common contexts include long standing Fuchs endothelial dystrophy and endothelial damage after intraocular surgery. Without treatment, bullous keratopathy can severely reduce vision and comfort.

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Causes of Bullous Keratopathy

Bullous keratopathy arises when the corneal endothelium can no longer pump fluid out of the stroma effectively. Causes include Fuchs endothelial corneal dystrophy, prior cataract or glaucoma surgery, trauma, uveitis, and long term contact lens or intraocular lens related damage. Chronic elevated intraocular pressure also stresses endothelial cells. As pump function declines, fluid accumulates, thickening the cornea and leading to epithelial microcysts and bullae.

Symptoms and Clinical Features

Patients notice blurred or hazy vision, often worse on waking and improving slightly during the day as some fluid evaporates. Pain, foreign body sensation, and tearing occur when bullae reach the surface and rupture. On slit lamp exam, the cornea appears thickened and steamy with epithelial and subepithelial bullae, especially centrally. Endothelial guttata or surgical changes point to the underlying cause. In advanced cases, scarring and vascularization may develop.

How Is Bullous Keratopathy Diagnosed?

Diagnosis is based on clinical examination showing corneal edema with epithelial bullae in the setting of endothelial compromise. Pachymetry documents increased corneal thickness. Specular or confocal microscopy assesses endothelial cell density and morphology. The clinician reviews surgical history, prior corneal disease, and intraocular pressure. Distinguishing bullous keratopathy from other causes of edema, such as acute angle closure, guides appropriate treatment.

How Is Bullous Keratopathy Managed?

Management has two goals: relieve pain from epithelial bullae and restore or replace failing endothelium. Hypertonic saline drops and ointments draw fluid out of the cornea and offer temporary clarity. Lubricants, bandage contact lenses, or anterior stromal puncture help reduce pain from recurrent bullae. Definitive treatment often involves endothelial keratoplasty procedures such as DSEK or DMEK, or full thickness penetrating keratoplasty in complex cases. Control of intraocular pressure and any inflammation supports endothelial health.

FAQs About Bullous Keratopathy

Does bullous keratopathy always require a corneal transplant?

Not always, but many patients with significant symptoms and poor vision benefit from endothelial keratoplasty. Mild cases or those in patients unfit for surgery may be managed with medical and surface treatments alone. The decision depends on visual goals and overall health.

Why is my vision worse in the morning with bullous keratopathy?

While you sleep, the eyelids are closed and evaporation from the cornea is reduced, so fluid builds up and edema increases. During the day, some fluid evaporates, making the cornea slightly clearer. Hypertonic saline can help counter this effect.

Can bullous keratopathy return after endothelial keratoplasty?

Edema usually improves dramatically after successful grafting, but recurrent edema can occur if the new endothelium fails or is rejected. Regular follow up and prompt treatment of rejection episodes help prolong graft survival.

What can I do at home to ease bullous keratopathy discomfort?

Using prescribed hypertonic saline and lubricants as directed, avoiding eye rubbing, and wearing protective eyewear in windy or dry environments can ease symptoms. Report any sudden increase in pain, redness, or vision loss to your eye doctor quickly.