refraction defect due to irregularities of the surface of the cornea or lens
Keratoconus Keratoconus (KC) is a disorder of the eye which results in progressive thinning of the cornea.[3] This may result in blurry vision, double vision, nearsightedness, astigmatism, and light sensitivity.[3] Usually both eyes are affected.[3] In more severe cases a scarring or a circle may be seen within the cornea.[4]