Usually congenital corneal leukoplakia does not deteriorate. Acquired corneal leukoplakia is the scar tissue that heals after corneal injury, and the scar formation will lead to corneal nutritional disorders, corneal epithelial erosion for a long time, and the ulcer formed on the corneal scar, which often has no irritation symptoms, so it is also called “cold ulcer”. Since the local pathology is scar tissue and degenerates into atherosclerotic ulcers, it is also called atherosclerotic ulcers.