There are several possibilities for severe eye congestion: First, acute conjunctivitis. When acute conjunctivitis occurs, the conjunctiva is severely congested, and the closer to the conjunctival sac the heavier the congestion is, with a distinct foreign body sensation, photophobia, tearing, and excessive eye discharge. You can order levofloxacin eye drops 3-5 times a day and apply levofloxacin eye gel at night before going to bed. Acute iridocyclitis, when acute iridocyclitis occurs, the conjunctival congestion is severe, the closer to the cornea the heavier the congestion, there is eye pain, blurred vision, you need to dilate the pupil to make the ciliary muscle rest, point flumetron eye drops once / hour, gradually reduce the amount after the symptoms are reduced. Acute attack of acute angle-closure glaucoma, patients will have obvious eye pain and ipsilateral headache, sudden loss of vision, severe eye congestion and corneal edema, requiring pupil reduction and IOP lowering treatment. Endophthalmitis, when endophthalmitis occurs, the patient will have severe congestion and heavy eye pain, requiring anti-inflammatory treatment and, if necessary, removal of the eye.