In this study investigators are going to do amniotic membrane transplantation (AMT), early in the first week for bacterial keratitis. Investigators are comparing this technique with no amniotic membrane transplantation (NAMT) in a clinical trial, Inform consent is going to be taken, then the enrolment population is added in the study. Investigators are going to compare the final scar size, the time to scar formation, perforation rate , early need to penetrating keratoplasty (PKP), risk of vision loss (being no light perception (NLP) between two groups.This trial has been approved by the review board in Tehran University of Medical Sciences.( 487/5671)