Keratoconus is a progressive eye condition where the cornea, the clear front part of the eye, thins and bulges into a cone shape. This irregular shape can distort vision, causing blurriness and increased sensitivity to light. It typically begins in the teenage years or early adulthood and can affect one or both eyes. The exact cause of keratoconus is not fully understood, but genetic factors and environmental influences may play a role. Treatment options vary based on severity and can include glasses, contact lenses, or surgical procedures to improve vision and stabilize the cornea.