Various pathogenic factors put the conjunctiva in a damaged state, causing lesions that lead to edema called conjunctival edema; if not properly taken care of, it can lead to keratitis and corneal ulcers in mild cases, or infection or even blindness in severe cases. What are the symptoms related to conjunctival edema and corneal ulcers? 1, conjunctival lightening or pallor conjunctival lightening or pallor refers to the lightening or pallor of the conjunctiva when there is varying degrees of anemia. 2, petechiae appear on the conjunctiva sepsis clinical onset is rapid, its rash is petechiae, urticaria, pustular rash and scarlet fever-like rash and other forms, petechiae appear on the conjunctiva. 3, conjunctival nigra kanagener’s syndrome (kartagener’s syndrome), also known as bronchiectasis – paranasal sinusitis – visceral transposition syndrome, was first reported by stewat in 1902. Bronchiectasis-paranasal sinusitis-visceral transposition syndrome can cause conjunctival darkening. If conjunctival edema is not properly cared for, it can cause keratitis and corneal ulcers in mild cases, or infection or even blindness in severe cases. In the early stage of corneal ulcer, the eye has obvious irritation symptoms, photophobia, tearing, eye pain, grayish white dots or lamellar infiltration on the cornea; in severe cases, the above symptoms are more obvious, unable to open the eye, eye pain, vision loss. The conjunctiva is purplish-red and congested, and the closer it is to the cornea, the more serious it is, and grayish-white necrotic tissue is seen on the surface of the cornea, forming ulcers. If the bacteria are virulent, combined with chronic dacryocystitis or systemic resistance is reduced, the ulcer spreads to the surrounding or deeper layers, forming pus in the anterior chamber, and even causing corneal perforation, causing serious damage to vision. Pseudomonas aeruginosa corneal ulcers often cause corneal perforation within 1-2 days, with very serious consequences. Mycobacterial corneal ulcer, on the other hand, starts with mild symptoms, irregular ulcer surface, grayish-white, and pus often accumulates in the anterior chamber.