What is keratoconus? Keratoconus is an eye condition in which the cornea (the clear part in the front of the eye) becomes thinner and more curved. Source: Brian Chicoine, MD Tags:blurred visioncontact lensescorneacorneal cross-linkingcorneal transplantdistorted visioneye conditioneye healthglassesKeratoconuslight sensitivityophthalmologyVisionvision problems