<prompt> Intact cornea can be penetrated byGonococcusPseudomonasStreptococcusPneumococcus  <response>: A few species of bacteria are capable of penetrating an intact corneal epithelium -i. Neisseria gonorrhoeaii. Corynebacterium diphtherieaiii. Haemophilus agyptusiv. Neisseria meningitidisv. Listeria species Bacteria which cause comeal ulcer after epithelial injuries are -i. Pseudomonasii. Pneumococcusiii. Staphylococcus aureusiv. Morexellav. Streptococcus epidermidsvi. Enterobacterias Most common bacterial cause of keratitis;comeal ulcer Staphylococcus aureus, Most common cause of keratitiscomeal ulcer in a contact lens wearer Pseudomonas o Most common viral cause of keratitiscomeal ulcer HSV 