Keratoconus – The Story of a Thinning Window

Imagine looking through a clear glass window. Over time, instead of staying flat, the glass begins to bulge outward, forming a cone. The image on the other side looks distorted, blurred, and sometimes even doubled. This is the story of Keratoconus, a condition where the normally dome-shaped cornea (the clear front part of the eye) becomes thin and gradually bulges into a cone shape.

What is Keratoconus?

Keratoconus is an eye condition in which the cornea progressively thins and protrudes forward in a cone-like shape. Since the cornea is the main lens of the eye, even a small distortion can lead to significant vision changes.

When Does It Occur?

Keratoconus typically begins in the teenage years or early adulthood. It progresses slowly over time but can sometimes worsen more rapidly, especially during adolescence.

How Does It Occur?

The exact cause is not fully known, but keratoconus occurs due to weakening of corneal collagen fibers, which normally give the cornea its strength and shape. Genetics, environmental triggers, and habits like frequent eye rubbing all play a role.

• Why Does It Occur?

• The reasons are a mix of hereditary and environmental factors:

• Family history of keratoconus

• Excessive eye rubbing

• Allergic eye diseases

• Certain connective tissue disorders

Symptoms – What Does a Person Notice?

• In the early stages, vision may just be slightly blurred, like looking through a fogged-up glass. As it progresses:

• Frequent changes in spectacle power

• Blurred or distorted vision

• Double or ghost images

• Increased sensitivity to light

• Difficulty seeing at night

Treatment Options

• Treatment depends on severity:

• Glasses or contact lenses – help in early stages

• Rigid gas permeable (RGP) or scleral contact lenses – provide clearer vision in advanced cases

• Collagen Cross-Linking (CXL) – strengthens the cornea to halt progression

• Intracorneal ring segments (ICRS) – small implants that help flatten the cornea

• Corneal transplant – for severe, advanced keratoconus when vision cannot be corrected otherwise.