Microbial keratitis is a major cause of corneal opacity and loss of vision worldwide. 1 Ulcerative microbial keratitis remains a leading cause of blindness worldwide. 2 The most common causative organisms are bacteria, although fungi and protists can also cause keratitis. 1 Bacterial keratitis is potentially more devastating ocular infection. 3 The most common bacteria associated with corneal ulcer are Pseudomonas aeruginosa, Staphylococcus aureus, coagulase-negative Staphylococci and Streptococcus pneumoniae. 4-5