What is Keratoconus?

Keratoconus is a condition in which the normally dome shaped cornea, the clear window at the front of the eye, becomes progressively thinner, more cone-shaped and bulging. It affects up to one in every 1,000 people and usually appears in the early teens, often progressing over the next 10-20 years^1^.


The exact cause of keratoconus is unknown, but it is more common in people with allergies such as eczema as asthma, and is often associated with eye rubbing. Genetic factors are also involved as it is more commonly seen in people with Down’s syndrome or Marfan’s disease, and people of Asian heritage^1^.



  1. MOORFIELDS Eye Hospital NHS – Keratoconus. available at:
  2. National Keratoconus Foundations – Keratoconus Symptoms. Available at:


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