Corneal scarring involves the formation of scar tissue on the cornea, the clear, dome-shaped surface covering the eye's front. It can result from infections, injuries, diseases, surgery complications, or severe dry eye. Symptoms include blurred vision, glare, halos around lights, eye pain, redness, and light sensitivity. Diagnosis typically involves visual acuity tests, slit-lamp examination, and corneal topography. Treatment ranges from medications and specialty contact lenses for mild cases to laser procedures or corneal transplants for severe scarring. Preventive measures include protecting the eyes, treating infections promptly, and managing underlying conditions.