Other corneal deformities digital illustration

Other corneal deformities Save

ICD-10 code: H18.79

Chapter: Diseases of the eye and adnexia

Understanding Other Corneal Deformities

The cornea is the clear, dome-shaped surface that covers the front of the eye. It plays a crucial role in focusing light and protecting the eye from dust, dirt, and other external factors. However, like any other part of the body, the cornea can develop various deformities that can affect vision and eye health.

While most people are familiar with common corneal conditions such as astigmatism, myopia, and hyperopia, there are other corneal deformities that are less well-known but equally important to recognize and treat.

Types of Other Corneal Deformities
  1. Pellucid Marginal Degeneration (PMD): This is a rare condition characterized by a thinning of the cornea that occurs in the lower part of the eye. PMD can cause irregular astigmatism, which can result in distorted and blurred vision.
  2. Keratoglobus: This is a condition where the cornea becomes extremely thin and bulges outward, resulting in a cone-like shape. Keratoglobus can cause severe visual impairment and is often associated with other eye disorders such as blue sclera.
  3. Terrien’s Marginal Degeneration: This is a rare, progressive condition that affects the peripheral cornea, causing it to thin and become opaque. Terrien’s Marginal Degeneration can cause significant vision loss and is often treated with corneal transplantation.
  4. Corneal Ectasia: This is a condition where the cornea thins and bulges forward, resulting in a cone-like shape. Corneal Ectasia is often associated with keratoconus, a condition that affects the structural integrity of the cornea and causes it to become weak and bulge.
Treatment Options

The treatment options for other corneal deformities depend on the specific condition and its severity. In some cases, contact lenses or glasses may be sufficient to correct vision problems. However, more severe cases may require surgical intervention.

Corneal transplantation is a common treatment for conditions such as Terrien’s Marginal Degeneration and Keratoglobus. During the procedure, a donor cornea is transplanted onto the affected eye to replace the damaged cornea. This can restore vision and improve eye health.


While other corneal deformities may be less common than traditional vision problems, they can be just as severe and require specialized treatment. If you experience any changes in your vision or eye health, it’s important to schedule an appointment with an eye doctor to receive a proper diagnosis and