hello..u will have to ask yr doc..about the keratitis
..is it active?? as u said u got the infection from rain water last yr..so i'm worried that it may be a fungal infection/acanthoameba..or bacterial infection..this can only be told by the doc clinically by clinical picture or get the scrapping-diagnostic of the keratitis area..
u have to be serious..otherwise..problem suddenly may get worse..
please rule out fungal infection/acanthamoeba-by lab test after scrapping of the infected tissue ,otherwise..predforte will suppress the symptoms superficially but deep inside the cornea
..fungus will grow..i'm waiting the response from u..thanks