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What Is Disciform Keratitis?

Disciform keratitis is a form of stromal keratitis marked by disc shaped corneal edema, usually caused by viral endotheliitis from herpes simplex or herpes zoster. The endothelium becomes inflamed and its pump function weakens, so fluid collects in a round or oval area of the stroma. The overlying epithelium can stay intact or show mild changes. Patients notice blurred vision, halos, and light sensitivity. Without treatment, scarring and long term haze can develop.

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What Is Disciform Keratitis?

Disciform keratitis is a form of stromal keratitis marked by disc shaped corneal edema, usually caused by viral endotheliitis from herpes simplex or herpes zoster. The endothelium becomes inflamed and its pump function weakens, so fluid collects in a round or oval area of the stroma. The overlying epithelium can stay intact or show mild changes. Patients notice blurred vision, halos, and light sensitivity. Without treatment, scarring and long term haze can develop.

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Causes of Disciform Keratitis

The most common cause is herpes simplex virus type 1 affecting the corneal endothelium. Herpes zoster ophthalmicus and, less often, other viral or immune processes can create a similar picture. The inflammatory response to viral antigens at the endothelium disrupts normal fluid balance. Prior episodes of epithelial herpes keratitis or a history of herpes skin lesions raise suspicion. Disciform changes can also appear after vaccination or in association with other immune triggers, though this is less frequent.

Symptoms and Clinical Features

Patients often report gradual blur in one eye, glare around lights, and mild discomfort or ache. Photophobia and tearing can occur, but pain is usually less intense than with a large epithelial ulcer. On slit lamp exam, a round or oval area of stromal edema is seen with folds in Descemet's membrane and fine keratic precipitates on the endothelium beneath the lesion. The overlying epithelium may show mild punctate changes, and the rest of the cornea often looks relatively clear. Intraocular pressure can be elevated in some cases.

How Is Disciform Keratitis Diagnosed?

Diagnosis is based on clinical findings of localized stromal edema with endothelial precipitates in a disc pattern, usually in an eye with current or past herpes infection. The eye doctor checks corneal sensation, which is often reduced in herpetic disease. Anterior chamber reaction and pressure are assessed. Laboratory tests such as PCR of aqueous fluid are reserved for atypical or severe cases. It is important to separate disciform keratitis from bacterial keratitis and other stromal diseases, because treatment approaches differ.

How Is Disciform Keratitis Managed?

Management typically combines antiviral therapy with cautious topical steroids under specialist supervision. Oral antivirals such as acyclovir or related agents help suppress viral activity. Topical steroids are used to reduce stromal and endothelial inflammation once active epithelial viral disease is not present. Lubricants improve comfort, and pressure lowering drops are added if intraocular pressure rises. Treatment continues for weeks, with gradual tapering guided by clinical response to lower the risk of recurrence.

FAQs About Disciform Keratitis

Is disciform keratitis contagious?

The underlying herpes virus can spread, but disciform keratitis itself reflects a localized immune reaction in the cornea. Good hygiene and avoiding direct contact with active skin or mucosal lesions help limit transmission.

Can disciform keratitis cause permanent vision loss?

Many patients recover good vision, especially with early treatment, but some develop residual stromal haze or irregularity. Recurrent episodes increase the risk of scarring and chronic visual changes.

Why are steroids used if this is related to a virus?

Steroids help calm the immune inflammation at the endothelium that drives the disc shaped edema. They are paired with antiviral medicine to reduce the chance of viral reactivation, and are tapered carefully by the doctor.

Will I have more episodes after the first one?

Recurrent disease is possible, particularly in herpes simplex infection. Long term low dose oral antiviral therapy is sometimes used to reduce recurrences in people with frequent flares.