Keratoconus literally means “cone-shaped cornea”. The cornea is the clear dome of tissue on the front of the eye. Light enters through the cornea, which focuses the light rays so that you can see clearly.
Keratoconus is an inherited condition where the clear front surface of the eye, the cornea, is excessively elastic and with time starts to distort. The cornea ends up looking like the side of a pear, resulting in an asymmetry that causes visual distortion and blurred vision. It naturally progresses with time unless it can be stopped with treatment.