Subjects provided written consent. As appropriate, child assent was also obtained. At each study site, subjects were allocated to receive either povidone-iodine or the control medication. If corneal ulcers were present bilaterally, one eye was randomized to receive povidone-iodine, while the other received the control medication standard for that center. All subjects were hospitalized for at least 7 days for careful monitoring and appropriate treatment. To assure compliance, all subjects had their medications administered by medical personnel.