If your cornea changes shape and becomes more like a cone than a dome, your vision is likely to be less sharp. Treatments range from glasses or contact lenses to a cornea transplant. In most cases, keratoconus has no definite cause.
Keratoconus is a condition of the eye in which the normally rounded cornea bulges outward into a cone shape. The cornea is the clear, central part of the front surface of the eye. It protects your eye and helps you focus for clear vision. You pronounce keratoconus as care-ah-ta-KO-nus. The cause of keratoconus is largely unknown. Some studies have found that keratoconus runs in families, and that it happens more often in people who have certain medical conditions.
In most cases, you don’t have an eye injury or a disease that leads to keratoconus.