Treat according to different etiologies. 1. Infectious keratitis Remove causative factors, such as chronic dacryocystitis, management of lid entropion, and removal of corneal foreign bodies. Before the results of culture and drug sensitivity are reported, take a detailed history and give anti-infective drugs (antibacterial, antifungal, antiviral, antiamoebic, etc.), non-steroidal anti-inflammatory drugs (hormones are available for stromal and endothelial keratitis, and hormones are prohibited in the early stages of the remaining types of keratitis), and related adjuvant therapy based on slit lamp examination, combined with clinical experience. Keratitis that cannot be controlled by medications and is aggravated should be treated decisively with surgery. Including conjunctival flap coverage and corneal transplantation. 2, non-infectious keratitis According to different etiology, remove the cause, prevent infection, anti-inflammatory drugs and related adjuvant therapy, etc.. If necessary, consider surgical treatment such as amniotic membrane transplantation, conjunctival flap covering and corneal transplantation.