Keratitis can be divided into four stages according to pathological changes: the infiltration stage, the ulceration stage, the ulcer recession stage, and the healing stage. The condition of the cornea differs at each stage, and treatment must be administered accordingly. Treatments include anti-inflammatory eye drops, antiviral eye drops, and eye ointment therapy. When necessary, treatment can involve the use of a corneal bandage contact lens. If it reaches the healing stage, such as when scars form in the anterior elastic layer and the stromal layer, resulting in corneal opacity, nebula, and leukoma, this can affect vision and regular follow-ups may be required.