Keratoconus is a condition that causes gradually worsening vision.
The condition gets worse over time. It usually affects children, teenagers and young people. Special glasses and contact lenses can help to improve your vision. There is no cure however and you may require surgery.
Keratoconus occurs when the round, transparent layer covering the front of your eye (your cornea) gradually gets thinner. This makes it bulge, making it difficult to focus on things.