Fig. 4. Acute-onset endophthalmitis following cataract surgery. Left: Marked conjunctival congestion, fibrin in the pupil and anterior chamber, hypopyon, and visual acuity reduced to light perception on postoperative day 1. The patient was treated with pars plana vitrectomy and injected with intravitreal antibiotics. Right: The vitreous culture isolated Serratia marcescens. The final visual acuity improved to 20/50 but was limited by cystoid macular edema.