What is the definition or description of: keratoconus?

Irregular bulging: Keratoconus is an irregular or assymetric bulging and thinning of the cornea.

Cone shape: Kerato means cornea, conus means come-shape. A cone shaped instead of round cornea=keratoconus. In some patients this is a progressive problem that can lead to a need for surgery.

Thin Cornea: Keratoconus is a progressive disease that can change the shape of your cornea in one or both of your eyes. Keratoconus causes the corneal tissue to degenerate, eventually transforming the spherical shape of your cornea into a more cone-like shape, which bends light incorrectly.

Keratoconus: Keratoconus is a condition where the cornea bulges forward, leading to distorted vision. While keratoconus can start in childhood, it can also develop later in life. Eye rubbing is a known risk factor. Corneal collagen crosslinking has emerged as the first line treatment for keratoconus - as it can stop progression of the disease and often improve vision and the shape of the cornea.

Corneal ectasia: Keratoconus is a condition of the cornea (the window that lets light into the eye) in which the structural fibers maintaining the normal shape, weaken and respond to the pressure from indside the eye to bulge forward in an irregular way disturbing the ability of the eye to focus light and sometimes endangering the eye by causing central scarring and rarely perforation.