An inflammation that occurs within the corneal stroma, characterized by the absence of ulcers. The most typical case is caused by congenital syphilis infection, which often affects both eyes. It mainly occurs in teenagers and is now extremely rare in China. Diseases such as tuberculosis, rheumatism, and leprosy can also affect the eyes and cause stromal keratitis [1]. The affected eye has symptoms such as photophobia, tearing, eye pain, foreign body sensation, and decreased vision. The eyelids are often in a spasmodic state and difficult to open on their own. Corneal opacity generally starts from the edge and gradually spreads to the center of the cornea; when the inflammation reaches its peak, the cornea becomes very thick due to swelling, but ulcers never appear.