Corneal nebula

Corneal nebula is a corneal scar of varying degrees left after the healing of corneal ulcers. Clinically, it is classified into nebula, macula, and leucoma based on the severity of the corneal scar. This symptom is mainly characterized by a grayish-white, porcelain-white, or white-with-black appearance of the cornea. When the iris texture behind the scar is visible through it, it is called corneal nebula, primarily manifesting as blurred vision or obstructed vision.