Keratoconus is an eye disease that causes progressive thinning of
the central cornea (the clear "window" of the eye). This gives the cornea a
cone-shaped appearance and leads to blurred vision.
Keratoconus is a hereditary condition that first appears in the
late teen years.
If you have keratoconus, contact lenses can provide good vision and
allow you to avoid corrective surgery for many years.
WebMD Medical Reference from Healthwise