Bacterial DNA gyrase x Bacterial top IV x GR

This is a multicenter, 2-arm, randomized, prospective study of patients slated for bilateral cataract extraction. One eye will be randomized to the Study Arm, and the fellow eye will be randomized to the Control Arm.

Rose Bengal Electromagnetic Activation with Green light for Infection Reduction II (REAGIR II) is a randomized, double-masked feasibility study. The purpose of this study is to determine differences in 6-month visual acuity between medical antimicrobial treatments alone versus antimicrobial treatment plus cross-linking with rose Bengal (RB-PDT).
Patients presenting to one of the Aravind Eye Hospitals in India or to the Federal University of São Paulo ophthalmology clinic in Brazil with smear-positive and/or culture positive typical (I.e. non-Nocardia or Mycobacteria) bacterial corneal ulcers and moderate to severe vision loss, defined as Snellen visual acuity of 20/40 of worse, will be eligible for inclusion. Those who agree to participate will be randomized to one of two treatment groups:
* Group 6, RB-PDT Plus Early Steroids: topical 0.5% moxifloxacin plus topical difluprednate 0.05% plus RB-PDT
* Group 7, Sham RB-PDT Plus Early Steroids: topical 0.5% moxifloxacin plus topical difluprednate 0.05% plus sham RB-PDT

This is a phase I study evaluating safety and tolerability through the incidence of unexpected adverse events and IOP measurement, as well as through the incidence of stinging after its administration, compared to placebo.