Intact cornea can be penetrated by

A few species of bacteria are capable of penetrating an intact corneal epithelium - i. Neisseria gonorrhoea ii. Corynebacterium diphtheriea iii. Haemophilus agyptus iv. Neisseria meningitidis v. Listeria species  Bacteria which cause comeal ulcer after epithelial injuries are - i. Pseudomonas ii. Pneumococcus iii. Staphylococcus aureus iv. Morexella v. Streptococcus epidermids vi. Enterobacterias  Most common bacterial cause of keratitis;comeal ulcer → Staphylococcus aureus,  Most common cause of keratitis/comeal ulcer in a contact lens wearer → Pseudomonas o Most common viral cause of keratitis/comeal ulcer → HSV