When the cornea is damaged, its smoothness and clarity may be lost. Scars, swelling or irregular shape may cause the cornea to scatter or distort light, resulting in glare or blurred vision.
Your cornea may become hazy or damaged because of disease or injury. Corneal infections caused by inadequately cleaned contact lenses can lead to permanent corneal damage if not treated promptly. Trauma to the eye can likewise permanently injure the cornea, as can certain progressive diseases, such as keratoconus.